212 
DR. MARTIN BARRY ON THE CORPUSCLES OF THE BLOOD. 
became well circumscribed through this addition. These corpuscles 
exhibited a pellucid orifice. 
Fig. 32. Outline of a corpuscle from the same embryo ; the nucleus consisting of a 
single disc. 
Fig. 33. Sheep ( Ovis aries, Linn.) ; embryo of 2^ inches in length. Blood-cor- 
puscles after the addition of acetic acid. 
Fig. 34. Blood-corpuscles from the liver of the Ox-embryo from which figs. 31 and 
32 were taken. Acetic acid had been added, a. Corpuscles resembling 
those in fig. 27- (3, (3. Escaped nuclei ; each consisting of two discs, 
y, y. Corpuscles resembling those in fig. 33 ; but their compound nuclei 
separating into discs, h. Corpuscle exhibiting an orifice in its mem- 
brane ; the. sides of the orifice presenting a finely granular substance, 
g. Corpuscle containing three compound globules similar to those in 
fig. 30; but much more minute. Several of the corpuscles in this 
figure (fig. 34.) were seen to be filled with enlarged discs or incipient 
cells. A few of these have been represented in outline. 
Fig. 35. Outline of large cells found with those in the preceding figure. Their 
membranes appeared shrivelled. These cells were filled with altered 
discs, and more or less incipient cells. Each of their nuclei consisted 
of many discs, of a deep yellow (reddish) colour. (Such cells were 
found in blood from another embryo of the Ox, measuring in length 1^ 
inch.) 
PLATE XVIII. 
Fig. 36. Sparrow (tringilla domestica, Linn.). Blood-corpuscles, chiefly in outline. 
It will be observed that two of these are round. Like the rest, how- 
ever, these two were flattened. Round ones were seen only here and 
there, a. A group of young corpuscles of the blood. Their colour was 
the same as that of the other corpuscles in this figure; but they were 
less flattened. The pellucid space represented in some of these ob- 
jects (a), indicates the situation of the future nucleus (see the explana- 
tion of fig. 43.). (3. A blood-corpuscle in which there were observed 
discs or young cells around the nucleus. The nucleus has not been 
figured. 
Fig. 37. Sparrow ( Fringilla domestica, Linn.). Blood-corpuscles with their nuclei 
— both in outline — as seen after the addition of a minute quantity of 
acetic acid. The corpuscles on the left hand, in the figure, had under- 
gone only a partial change in their form from the acetic acid ; while 
those on the right (lying in another part of the field of view) had become 
globular from this acid, a, a, a. The nucleus has changed its position; 
