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POPULAR SCIENCE REVIEW. 
begins to develop. This is done in a very simple manner. At the end of 
the bud the inner wall, and with it the muscular layer, recede from the 
outer wall, and leave between them a space which is occupied by a dis- 
tinct, peculiarly coloured substance, which is no less than the incipient 
ovigerous layer. Contemporary with the origin of this layer, the eggs 
appear : in fact they may be said to form nine-tenths of the bulk of this 
stratum, the remainder constituting the intercellular blastema. The eggs, 
although eventually very numerous, are at first few in number, perhaps 
five or six, and compare in size with the cells of the outer wall of the 
bud. The germinal vesicle, which is very distinct, occupies about one- 
third of the entire diameter of the ovum. As the space between the walls 
of the bud increases, it gradually assumes a spheroidal form ; and as it is 
constantly filled by the ovigerous layer, the latter also becomes globular. 
Surrounding this space we have, on one side the outer wall at the end of 
the bud, and on the other side the inner wall lined by the muscular 
layer, and forming a sort of cup-shaped cavity. Gradually, and during 
the process of growth, the edge of the cup becomes narrowed, and by de- 
grees closes over the intervening space occupied b}^ the ovigerous layer, 
and shuts the latter off from the outer wall. Thus we have a medusoid 
whose structure from without is,— an outer wall and outer muscular layer, 
an inner cellular layer and inner muscular layer, and an ovigerous 
stratum in the centre. In this central matrix the eggs undergo their 
development, move freely within the genital, and eventually make their 
escape into the open sea. — Yide Silliman’s American Journal , vol. 
xxxvii., No. 109. 
'Pedantic Terminology. — A memoir appeared some time ago upon a 
system of classification of insects based upon characters of the head ; but 
it is so full of barbarous and unpronounceable expressions, as to be quite 
beyond the comprehension of most naturalists. Every fourth word in the 
paper we refer to is one of the author’s own invention, and as no explana- 
tion of its meaning is appended, the drift of the text is quite unintelligible. 
Whether the employment of new terms results from self-conceit or a 
desire to advance science, we cannot with certainty aver ; but it appears to 
us to have far more of its origin in the former than in the latter. How 
can a writer expect his opinions to be accepted when his descriptions are 
trammelled by such expressions as the following : “ Megasthenes ,” “ micro - 
sthenes” “ amplificate” (i perfunctionate” il pteroprosthenics” &c. 
Exeter Hall Science. — Most of our readers are aware of the difficulties 
raised by the Christian Young Men’s Association relative to the publica- 
tion of Professor Owen’s lecture. We believe that the lecture as pub- 
lished by that body was not exactly the one which Professor Owen de- 
livered ; it is therefore satisfactory to find that the original lecture has 
been published by Messrs. Longman under the superintendence of the 
Professor himself. To this pamphlet are appended several notes, in which 
the objections urged by certain divines are ably met. The Christian spirit 
in which Professor Owen advances his opinions must appeal to all who 
are desirous of examining the question of Scriptural science in an im- 
partial manner. His analogies are admirably drawn, and must convince 
even the most unintelligent readers. 
