WatsonOverHere/Summa_Theologica huggingface dataset:
Q: Whether the Substantial Form of the Bread Remains in This Sacrament After the Consecration?

A: On the contrary,
The substantial form of bread is of the substance of bread. But the substance of the bread is changed into the body of Christ, as stated above (AA. 2, 3, 4). Therefore the substantial form of the bread does not remain.

I answer that,
Some have contended that after the consecration not only do the accidents of the bread remain, but also its substantial form. But this cannot be. First of all, because if the substantial form of the bread were to remain, nothing of the bread would be changed into the body of Christ, excepting the matter; and so it would follow that it would be changed, not into the whole body of Christ, but into its matter, which is repugnant to the form of the sacrament, wherein it is said: "This is My body."

Secondly, because if the substantial form of the bread were to remain, it would remain either in matter, or separated from matter. The first cannot be, for if it were to remain in the matter of the bread, then the whole substance of the bread would remain, which is against what was said above (A. 2). Nor could it remain in any other matter, because the proper form exists only in its proper matter. But if it were to remain separate from matter, it would then be an actually intelligible form, and also an intelligence; for all forms separated from matter are such.

Thirdly, it would be unbefitting this sacrament: because the accidents of the bread remain in this sacrament, in order that the body of Christ may be seen under them, and not under its proper species, as stated above (A. 5).

And therefore it must be said that the substantial form of the bread does not remain.

Reply Obj. 1: There is nothing to prevent art from making a thing whose form is not an accident, but a substantial form; as frogs and serpents can be produced by art: for art produces such forms not by its own power, but by the power of natural energies. And in this way it produces the substantial forms of bread, by the power of fire baking the matter made up of flour and water.

Reply Obj. 2: The soul is the form of the body, giving it the whole order of perfect being, i.e. being, corporeal being, and animated being, and so on. Therefore the form of the bread is changed into the form of Christ's body, according as the latter gives corporeal being, but not according as it bestows animated being.

Reply Obj. 3: Some of the operations of bread follow it by reason of the accidents, such as to affect the senses, and such operations are found in the species of the bread after the consecration on account of the accidents which remain. But some other operations follow the bread either by reason of the matter, such as that it is changed into something else, or else by reason of the substantial form, such as an operation consequent upon its species, for instance, that it "strengthens man's heart" (Ps. 103:15); and such operations are found in this sacrament, not on account of the form or matter remaining, but because they are bestowed miraculously upon the accidents themselves, as will be said later (Q. 77, A. 3, ad 2, 3; AA. 5, 6).
Q: Objection 1: It seems that the substantial form of the bread remains in this sacrament after the consecration. For it has been said (A. 5) that the accidents remain after the consecration. But since bread is an artificial thing, its form is an accident. Therefore it remains after the consecration.

Obj. 2: Further, the form of Christ's body is His soul: for it is said in
De Anima
ii, that the soul "is the act of a physical body which has life in potentiality". But it cannot be said that the substantial form of the bread is changed into the soul. Therefore it appears that it remains after the consecration.

Obj. 3: Further, the proper operation of a things follows its substantial form. But what remains in this sacrament, nourishes, and performs every operation which bread would do were it present. Therefore the substantial form of the bread remains in this sacrament after the consecration.
Q: Objection 1: It seems that this change is not wrought instantaneously, but successively. For in this change there is first the substance of bread, and afterwards the substance of Christ's body. Neither, then, is in the same instant, but in two instants. But there is a mid-time between every two instants. Therefore this change must take place according to the succession of time, which is between the last instant in which the bread is there, and the first instant in which the body of Christ is present.

Obj. 2: Further, in every change something is
in becoming
and something is in being. But these two things do not exist at the one time for, what is in becoming, is not yet, whereas what is in being, already is. Consequently, there is a before and an after in such change: and so necessarily the change cannot be instantaneous, but successive.

Obj. 3: Further, Ambrose says (De Sacram. iv) that this sacrament "is made by the words of Christ." But Christ's words are pronounced successively. Therefore the change takes place successively.
Q: Objection 1: It seems that this proposition is false: "The body of Christ is made out of bread." For everything out of which another is made, is that which is made the other; but not conversely: for we say that a black thing is made out of a white thing, and that a white thing is made black: and although we may say that a man becomes black still we do not say that a black thing is made out of a man, as is shown in
Phys.
i. If it be true, then, that Christ's body is made out of bread, it will be true to say that bread is made the body of Christ. But this seems to be false, because the bread is not the subject of the making, but rather its term. Therefore, it is not said truly that Christ's body is made out of bread.

Obj. 2: Further, the term of
becoming
is something that is, or something that is made. But this proposition is never true: "The bread is the body of Christ"; or "The bread is made the body of Christ"; or again, "The bread will be the body of Christ." Therefore it seems that not even this is true: "The body of Christ is made out of bread."

Obj. 3: Further, everything out of which another is made is converted into that which is made from it. But this proposition seems to be false: "The bread is converted into the body of Christ," because such conversion seems to be more miraculous than the creation of the world, in which it is not said that non-being is converted into being. Therefore it seems that this proposition likewise is false: "The body of Christ is made out of bread."

Obj. 4: Further, that out of which something is made, can be that thing. But this proposition is false: "Bread can be the body of Christ." Therefore this is likewise false: "The body of Christ is made out of bread."
Q: Objection 1: It seems that the whole Christ is not contained under this sacrament, because Christ begins to be in this sacrament by conversion of the bread and wine. But it is evident that the bread and wine cannot be changed either into the Godhead or into the soul of Christ. Since therefore Christ exists in three substances, namely, the Godhead, soul and body, as shown above (Q. 2, A. 5; Q. 5, AA. 1, 3), it seems that the entire Christ is not under this sacrament.

Obj. 2: Further, Christ is in this sacrament, forasmuch as it is ordained to the refection of the faithful, which consists in food and drink, as stated above (Q. 74, A. 1). But our Lord said (John 6:56): "My flesh is meat indeed, and My blood is drink indeed." Therefore, only the flesh and blood of Christ are contained in this sacrament. But there are many other parts of Christ's body, for instance, the nerves, bones, and such like. Therefore the entire Christ is not contained under this sacrament.

Obj. 3: Further, a body of greater quantity cannot be contained under the measure of a lesser. But the measure of the bread and wine is much smaller than the measure of Christ's body. Therefore it is impossible that the entire Christ be contained under this sacrament.
Q: Whether the Whole Christ Is Contained Under Each Species of This Sacrament?

A: On the contrary,
The gloss on 1 Cor. 11:25, commenting on the word "Chalice," says that "under each species," namely, of the bread and wine, "the same is received"; and thus it seems that Christ is entire under each species.

I answer that,
After what we have said above (A. 1), it must be held most certainly that the whole Christ is under each sacramental species yet not alike in each. For the body of Christ is indeed present under the species of bread by the power of the sacrament, while the blood is there from real concomitance, as stated above (A. 1, ad 1) in regard to the soul and Godhead of Christ; and under the species of wine the blood is present by the power of the sacrament, and His body by real concomitance, as is also His soul and Godhead: because now Christ's blood is not separated from His body, as it was at the time of His Passion and death. Hence if this sacrament had been celebrated then, the body of Christ would have been under the species of the bread, but without the blood; and, under the species of the wine, the blood would have been present without the body, as it was then, in fact.

Reply Obj. 1: Although the whole Christ is under each species, yet it is so not without purpose. For in the first place this serves to represent Christ's Passion, in which the blood was separated from the body; hence in the form for the consecration of the blood mention is made of its shedding. Secondly, it is in keeping with the use of this sacrament, that Christ's body be shown apart to the faithful as food, and the blood as drink. Thirdly, it is in keeping with its effect, in which sense it was stated above (Q. 74, A. 1) that "the body is offered for the salvation of the body, and the blood for the salvation of the soul."

Reply Obj. 2: In Christ's Passion, of which this is the memorial, the other parts of the body were not separated from one another, as the blood was, but the body remained entire, according to Ex. 12:46: "You shall not break a bone thereof." And therefore in this sacrament the blood is consecrated apart from the body, but no other part is consecrated separately from the rest.

Reply Obj. 3: As stated above, the body of Christ is not under the species of wine by the power of the sacrament, but by real concomitance: and therefore by the consecration of the wine the body of Christ is not there of itself, but concomitantly.
Q: Objection 1: It seems that the whole Christ is not contained under both species of this sacrament. For this sacrament is ordained for the salvation of the faithful, not by virtue of the species, but by virtue of what is contained under the species, because the species were there even before the consecration, from which comes the power of this sacrament. If nothing, then, be contained under one species, but what is contained under the other, and if the whole Christ be contained under both, it seems that one of them is superfluous in this sacrament.

Obj. 2: Further, it was stated above (A. 1, ad 1) that all the other parts of the body, such as the bones, nerves, and the like, are comprised under the name of flesh. But the blood is one of the parts of the human body, as Aristotle proves (De Anima Histor. i). If, then, Christ's blood be contained under the species of bread, just as the other parts of the body are contained there, the blood ought not to be consecrated apart, just as no other part of the body is consecrated separately.

Obj. 3: Further, what is once
in being
cannot be again in becoming. But Christ's body has already begun to be in this sacrament by the consecration of the bread. Therefore, it cannot begin again to be there by the consecration of the wine; and so Christ's body will not be contained under the species of the wine, and accordingly neither the entire Christ. Therefore the whole Christ is not contained under each species.
Q: Whether Christ Is Entire Under Every Part of the Species of the Bread and Wine?

A: On the contrary,
Augustine says in a sermon (Gregory, Sacramentarium): "Each receives Christ the Lord, Who is entire under every morsel, nor is He less in each portion, but bestows Himself entire under each."

I answer that,
As was observed above (A. 1, ad 3), because the substance of Christ's body is in this sacrament by the power of the sacrament, while dimensive quantity is there by reason of real concomitance, consequently Christ's body is in this sacrament substantively, that is, in the way in which substance is under dimensions, but not after the manner of dimensions, which means, not in the way in which the dimensive quantity of a body is under the dimensive quantity of place.

Now it is evident that the whole nature of a substance is under every part of the dimensions under which it is contained; just as the entire nature of air is under every part of air, and the entire nature of bread under every part of bread; and this indifferently, whether the dimensions be actually divided (as when the air is divided or the bread cut), or whether they be actually undivided, but potentially divisible. And therefore it is manifest that the entire Christ is under every part of the species of the bread, even while the host remains entire, and not merely when it is broken, as some say, giving the example of an image which appears in a mirror, which appears as one in the unbroken mirror, whereas when the mirror is broken, there is an image in each part of the broken mirror: for the comparison is not perfect, because the multiplying of such images results in the broken mirror on account of the various reflections in the various parts of the mirror; but here there is only one consecration, whereby Christ's body is in this sacrament.

Reply Obj. 1: Number follows division, and therefore so long as quantity remains actually undivided, neither is the substance of any thing several times under its proper dimensions, nor is Christ's body several times under the dimensions of the bread; and consequently not an infinite number of times, but just as many times as it is divided into parts.

Reply Obj. 2: The determinate distance of parts in an organic body is based upon its dimensive quantity; but the nature of substance precedes even dimensive quantity. And since the conversion of the substance of the bread is terminated at the substance of the body of Christ, and since according to the manner of substance the body of Christ is properly and directly in this sacrament; such distance of parts is indeed in Christ's true body, which, however, is not compared to this sacrament according to such distance, but according to the manner of its substance, as stated above (A. 1, ad 3).

Reply Obj. 3: This argument is based on the nature of a body, arising from dimensive quantity. But it was said above (ad 2) that Christ's body is compared with this sacrament not by reason of dimensive quantity, but by reason of its substance, as already stated.
Q: Objection 1: It seems that Christ is not entire under every part of the species of bread and wine. Because those species can be divided infinitely. If therefore Christ be entirely under every part of the said species, it would follow that He is in this sacrament an infinite number of times: which is unreasonable; because the infinite is repugnant not only to nature, but likewise to grace.

Obj. 2: Further, since Christ's is an organic body, it has parts determinately distant. For a determinate distance of the individual parts from each other is of the very nature of an organic body, as that of eye from eye, and eye from ear. But this could not be so, if Christ were entire under every part of the species; for every part would have to be under every other part, and so where one part would be, there another part would be. It cannot be then that the entire Christ is under every part of the host or of the wine contained in the chalice.

Obj. 3: Further, Christ's body always retains the true nature of a body, nor is it ever changed into a spirit. Now it is the nature of a body for it to be "quantity having position" (Predic. iv). But it belongs to the nature of this quantity that the various parts exist in various parts of place. Therefore, apparently it is impossible for the entire Christ to be under every part of the species.
Q: Whether the Whole Dimensive Quantity of Christ's Body Is in This Sacrament?

A: On the contrary,
The existence of the dimensive quantity of any body cannot be separated from the existence of its substance. But in this sacrament the entire substance of Christ's body is present, as stated above (AA. 1, 3). Therefore the entire dimensive quantity of Christ's body is in this sacrament.

I answer that,
As stated above (A. 1), any part of Christ is in this sacrament in two ways: in one way, by the power of the sacrament; in another, from real concomitance. By the power of the sacrament the dimensive quantity of Christ's body is not in this sacrament; for, by the power of the sacrament that is present in this sacrament, whereat the conversion is terminated. But the conversion which takes place in this sacrament is terminated directly at the substance of Christ's body, and not at its dimensions; which is evident from the fact that the dimensive quantity of the bread remains after the consecration, while only the substance of the bread passes away.

Nevertheless, since the substance of Christ's body is not really deprived of its dimensive quantity and its other accidents, hence it comes that by reason of real concomitance the whole dimensive quantity of Christ's body and all its other accidents are in this sacrament.

Reply Obj. 1: The manner of being of every thing is determined by what belongs to it of itself, and not according to what is coupled accidentally with it: thus an object is present to the sight, according as it is white, and not according as it is sweet, although the same object may be both white and sweet; hence sweetness is in the sight after the manner of whiteness, and not after that of sweetness. Since, then, the substance of Christ's body is present on the altar by the power of this sacrament, while its dimensive quantity is there concomitantly and as it were accidentally, therefore the dimensive quantity of Christ's body is in this sacrament, not according to its proper manner (namely, that the whole is in the whole, and the individual parts in individual parts), but after the manner of substance, whose nature is for the whole to be in the whole, and the whole in every part.

Reply Obj. 2: Two dimensive quantities cannot naturally be in the same subject at the same time, so that each be there according to the proper manner of dimensive quantity. But in this sacrament the dimensive quantity of the bread is there after its proper manner, that is, according to commensuration: not so the dimensive quantity of Christ's body, for that is there after the manner of substance, as stated above (ad 1).

Reply Obj. 3: The dimensive quantity of Christ's body is in this sacrament not by way of commensuration, which is proper to quantity, and to which it belongs for the greater to be extended beyond the lesser; but in the way mentioned above (ad 1, 2).
Q: Objection 1: It seems that the whole dimensive quantity of Christ's body is not in this sacrament. For it was said (A. 3) that Christ's entire body is contained under every part of the consecrated host. But no dimensive quantity is contained entirely in any whole, and in its every part. Therefore it is impossible for the entire dimensive quantity of Christ's body to be there.

Obj. 2: Further, it is impossible for two dimensive quantities to be together, even though one be separate from its subject, and the other in a natural body, as is clear from the Philosopher (Metaph. iii). But the dimensive quantity of the bread remains in this sacrament, as is evident to our senses. Consequently, the dimensive quantity of Christ's body is not there.

Obj. 3: Further, if two unequal dimensive quantities be set side by side, the greater will overlap the lesser. But the dimensive quantity of Christ's body is considerably larger than the dimensive quantity of the consecrated host according to every dimension. Therefore, if the dimensive quantity of Christ's body be in this sacrament together with the dimensive quantity of the host, the dimensive quantity of Christ's body is extended beyond the quantity of the host, which nevertheless is not without the substance of Christ's body. Therefore, the substance of Christ's body will be in this sacrament even outside the species of the bread, which is unreasonable, since the substance of Christ's body is in this sacrament, only by the consecration of the bread, as stated above (A. 2). Consequently, it is impossible for the whole dimensive quantity of Christ's body to be in this sacrament.
Q: Objection 1: It seems that Christ's body is in this sacrament as in a place. Because, to be in a place definitively or circumscriptively belongs to being in a place. But Christ's body seems to be definitively in this sacrament, because it is so present where the species of the bread and wine are, that it is nowhere else upon the altar: likewise it seems to be there circumscriptively, because it is so contained under the species of the consecrated host, that it neither exceeds it nor is exceeded by it. Therefore Christ's body is in this sacrament as in a place.

Obj. 2: Further, the place of the bread and wine is not empty, because nature abhors a vacuum; nor is the substance of the bread there, as stated above (Q. 75, A. 2); but only the body of Christ is there. Consequently the body of Christ fills that place. But whatever fills a place is there locally. Therefore the body of Christ is in this sacrament locally.

Obj. 3: Further, as stated above (A. 4), the body of Christ is in this sacrament with its dimensive quantity, and with all its accidents. But to be in a place is an accident of a body; hence "where" is numbered among the nine kinds of accidents. Therefore Christ's body is in this sacrament locally.
Q: Objection 1: It seems that Christ's body is movably in this sacrament, because the Philosopher says (Topic. ii) that "when we are moved, the things within us are moved": and this is true even of the soul's spiritual substance. "But Christ is in this sacrament," as shown above (Q. 74, A. 1). Therefore He is moved when it is moved.

Obj. 2: Further, the truth ought to correspond with the figure. But, according to the commandment (Ex. 12:10), concerning the Paschal Lamb, a figure of this sacrament, "there remained nothing until the morning." Neither, therefore, if this sacrament be reserved until morning, will Christ's body be there; and so it is not immovably in this sacrament.

Obj. 3: Further, if Christ's body were to remain under this sacrament even until the morrow, for the same reason it will remain there during all coming time; for it cannot be said that it ceases to be there when the species pass, because the existence of Christ's body is not dependent on those species. Yet Christ does not remain in this sacrament for all coming time. It seems, then, that straightway on the morrow, or after a short time, He ceases to be under this sacrament. And so it seems that Christ is in this sacrament movably.