New-York tribune. [volume] (New York [N.Y.]) 1866-1924, 1873-05-31

,. c. d. Trophosoms H'drOphTtop q Gono,ems a. ny
d. Empty AJdrOhsea GoGao9i9m 2 hy5rGssalGs rs, oo,o,
known Campanularia Johnstoni All the different in
dividuals there united as one community are buds de-
that account considered by him. in conformity with
Huxeys definition as one individual, including the
free fish born from them. In this community, all
the sterile individuals considered as unit, and
called TrOphOsome, and all the fertile individuals
another unit under the name OF Gonosome; while the
single sterile individuals have received the OF
Hydranths the sheath Of the head being called Hydro
anostomong base Hydrorhxa and the last together
Hydrophyton. The various combinations OF structural
ceved appropriate names, may be seen In the
wOod-cut But while recognize the advantage OF such
specific nomenclature to precision to the descrip
ton OF limited group OF animals cannot overlook the
great difficulties arising from such proceeding when
ever attempt TO the general relations which
bind the very same beings into larger groups Of higher
value. Prof Allmans nomenclature cannot DO extended
10 all the members Of the class OF Acaephs; 10 is
Incompatible with the peculiar structural features OF the
aaSs Hs s d sn
II We were 10 attempt an application OF this nomenoa
ture classes OF POlyps EchlnOderms should
entirely fail And yet nobody Will deny that Polyps
and Acaephs belong 70 one and the same primary dvis
the Echnoderms. Again. among Echinoderms them
selves naturasts have adopted special nomenclature
for Ornods, another entirely different for the star
fishes st another for the seaurchins and fourth for
the Holohurans 30 that IN fact the different members
OF the same class described II they In way
related one another. Though this method has
Questonaby led to more rapid progress OF the different
branches OF Zoology In their isolation IL has the
time formed an almost nsuperabe barrier 10 rational
| appreciation OF their comprehensive relations
Henceforth real advance possible in science
MI return more thorough and farreaching
tgaton OF the deeper neurological relations which unite
ali the members of each primary group OF the animal
Kingdom The future growth Of our science lies In that
direction.
STRIKING SIMILARITY OF ALL FORMS IN EMBRYO
Let turn attention TO entirely different
type. A fish, reptile, bird, quadruped, man are
all vererbates by their plan Of structure and by their
mode OF development and yet they entirely distinct
as members Of different classes Of the vertebrate type
have shown YOU former lecture that the structural
plan for all verterbates consists Of central axis with
solid mostly bony arch above, nclOsnR the nervous
OF Digestion reproduction circulation and respratOn
glance at their embryoORy will show that they are
united by their Developments closely by their ana
omy Suppose have here the egg OF a yertebrat IT,
OF any vertebrate, fish, reptile, bird or mammal
the result OF the augmentation Is the formation m
OF more completely kueaded yok substance on one sih
OF the yOlk One end OF this layer thckens more than
the other Along the middle, a slight depres-
consequence Of the rising and swelling OF the sides
which leads 10 the formation OF kind OF frroW IL ia In
fact only the folding upward OF the upper margins
and this goes till the margins meet and nclose
germ Is the beginning OF the arch within which tbe
nervous system contained. Then the lower margins
of the germ layer fold downward In the same way t
they also meet and form the lower cavity which the
which the first sketchng out eye; here
another fold the first indication OF the ear hero trans
verse hssures developed which are TO be the gs;
for giils In all yertebrates including man, In the
aud above the yok. the connection De-
and less. the yOk hangs like bag below the
body either slowly moro rapidly absorbed into
H. the case may be- ln Different yertebraes. aud tho