New-York daily tribune. [volume] (New-York [N.Y.]) 1842-1866, 1847-11-09

il shows how we ought TO consider these as arising
from the juncture OF the parallel threads, rather
than as one only with swellings intermediate and
far from being the exception to the rule, 1t gives
the true key TO the understanding OF this arrange
mcnt which in fact we did not know before tue
discovery of Mr. Blanchard.
The class Of worms, insects and crustacea rest
for their distinction particularly on the respiratory
organs-the circulation and mode of respiration
The worms are elongated cylindrical and com
posed OF very numerous rather soft rings The
skin shows superficial folds, and these folds are
movable on each other. not 70 be compared with
the hard rings of higher srtculated animals We
find In worms the greatest variety OF structure
There is perhaps class OF the animal kingdom
which shows more of this variety. Many characters
which are considered Of the highest value disappear
here entirely. For instance. IN the intestinal
worms we have no circulation whateyer-no heart
no blood.vessel-no blood even while IN other
worms of the same class and which cannot be sep
arAted from them, we have not only blood bat
blood Of the most raddy color-bloOd-yessels very
complicated. and not even one alone. butsometmes
three OF more pairs of hearts. Thus the most com
picated circulating apparatus and total absence
of blood vessels is found IN one and the same class
of animals More than that, some OF the worms
have organs OF sprAtiOn, gills, highly complicated
gis perhaps more complicated than the gills OF
fishes. or of any OF the mousca. The most com
plicated structure of the gs is iound In some oil the
worms In others there are not only no gllls but no
respiratory organs at all ! would go beyond that
In some we have an alimentary canal, which sim
pie There is only mouth and an alimentary canal
branching into the body and diifusng the product
of digestion like a bloodvessel through the organs
without causing that fluid 70 pass before through
peculiar tubes through any organs OF circulation
What then is there IN these IN common why
combine animals presenting such disslmilarity OF
structure7 This is really the question have TO
answe err because they have heretofore been divided
into distinct classes. Worms win respiratory
organs and circulating apparatus nave been united
into one aud the same class under the name Of
An1.fqfa and worms without these organs have
heen united in the class OF intestinal worms, while
some others which are less known and are also
narasitical have been formed INTO third class
under the name of TubRiarid. Inc common char
acter of all these insects is 70 have that body Of
elongated form with numerous articulstlons, the
wines connected in such a manner as to be NOV
sb On each other in all directions the structure Of
The akin being more simple than It is in higher
animals not being divided into 50 many lay ers and
the muscles 80 combined win the SKID as not
slvxavs easily 10 be distinguished, so that the
skin is formed OF interviewer muscular hores win
hard horny rings moving on eacn other
Agsfn The nervous system is uniformly construct
"A and there are intermediate types 50 numerous
that between those very complicated worms Win
highly organized organs OF circulation and respra
ton and those which have none at ali We md all
intermediate steps some where the circulation IS
ss,,bs- dsvelooed bat where the organs OF breath
inc are not SO highly organized, and rice reysa-
From the uniformity OF nervous structure and IRON
the fact iu.t mentioned with regard 70 the numer
an. intermediate steps ~ the cavity OF respiratory
and circaa,ory organs We are justified In arriving
AZ the conclusion that all these animals must be
combined Ia one class.
Tbs Iasera ia the full grown state has no organ
If circulation. AZ least they have 10 heart But
they breathe through very complicated system OF
airtubes penetrating into the body having numer-
oss external outlets. penetrating, like vessels,
throughout the body and undergoing considerable
and very striking metamorPn1ses whne me erus
,acea have circulation and breathe through the
gills. This evening must, however, limit myself
u the Investigation Of the worms
So many changes have to be made In The cAss-
fcation Of these animals. that, at present It Is
scarcely possible to admit any OF the elsssicsions
In the books, though these Consultations appear
very simple. and are founded upon cnHsc'ensucs
very easily recognised.
The frst division OF worlns IL the the Intestinal