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LXXIII. The Cells in the Ovum compared with Corpuscles of 
the Blood.—On the difference in Size of the Blood-corpuscles 
in different Animals. By Martin Barry, M.D., F.R.SS. 
LL. and E* 
1. YN several communications presented to the Royal So- 
ciety, and printed in the Philosophical ‘Transactions, it 
has been my endeavour to show that the remarkable process 
effecting the division and subdivision of what is usually termed 
the “yelk ” in the mammiferous ovum, is to be recognised in 
other cells; and nowhere more distinctly than in certain states 
of the corpuscles of the blood. In proof of this, I gave the de- 
lineations, figs. 1 to 5, along with many others. Figs. 1, 2, 3 
represent blood-corpuscles (cells) of 
the Sparrow. 1. The nucleus single : 
=~, 2. the nucleus dividing into two parts: 
4 (@) 3. this division is complete. Figs. 4, 5 
; are blood-corpuscles (cells) of the foetal 
2 ip ~ Ox, three-quarters of an inch in length. 
(S) 4. The nucleus consists of two discs: 
5. the discs have separated, and much 
increased in size, and they are pass- 
SZ) ing into the state of cells. - 
2. Such having been my views, it was very satisfactory to 
meet with the following confirmation of them. In a lecture 
delivered a few weeks since at the College 
j ) 
9 
of Surgeons, Professor Owen exhibited 
the sketches 6 to 10, in a thesis by Dr. 
a Bagge, representing successive stages in 
the development of the ovum of an intes- 
alo \ tinal worm; and stated the results of Dr. 
) Bagge’s observations. I find the following 
10 (,) remarks on this subject in the published 
@) lecture of Professor Owen :—“ There is a 
8 close and interesting analogy between the 
above phenomena|[ observed by Dr. Bagge, 
fig. 6 to 10}, which were published in 1841, 
and some of those communicated by Dr. M. Barry to the 
Royal Society, in January 1841, and published in the Philo- 
sophical Transactions of the same year. ‘The clear central 
nucleus of the blood-corpuscle is there shown to form two 
discst, which give origin to two cells. We may, likewise, 
* Communicated by the Author. 
+ De evolutione Strongyli auricularis et Ascaridis acuminate viviparorum. 
Erlange, 1841. 
t See Phil. Trans. 1841. pl. 18. fig. 37. [and pl. 17. fig. 24.] 
