260 
DR. MARTIN BARRY ON THE CORPUSCLES OF THE BLOOD. 
Fig. 136. Same chick. Outline of corresponding cells, from the same part, and in 
a more advanced state. The nuclei presented indications of division 
into discs (par. 161.). (Dilute spirit.) 
Fig. 137- From the leg of the same chick. Outline of a muscle-cylinder, contain- 
ing discs, a few of which are represented in the figure. The partitions 
between the original cells which form the cylinder, have disappeared. 
The nuclei were parietal, and composed of discs. The nucleus finished 
in delineation, exhibits these discs in concentric layers, around an ori- 
fice, communicating with the exterior of the cylinder (par. 161.). (Di- 
lute spirit.) 
Fig. 138. Tadpole, 5"'. Outline of part of the foundation of the crystalline lens, as 
it lay surrounded by black pigment, and imbedded in the vitreous 
humour. It had the appearance of an altered and greatly enlarged 
blood-corpuscle ; being throughout red, — except at a (the anterior part), 
where it was pellucid,— and being filled with discs resembling those 
arising in the interior of a corpuscle of the blood. These discs were 
largest and darkest at the part (3. 
Fig. 139. Tadpole, about 5'". Outline of cells forming a portion of the crystalline 
lens. They were very pale, yet tinged with red. Red colouring matter 
was seen between the cells. The interior of all these cells presented 
discs ; and here also was observed red colouring matter. The cell, the 
interior of which has been delineated in the figure, was brighter than 
the rest, and its discs were more defined. On being viewed repeatedly, 
for a considerable time, the appearance of the interior of this cell was 
found to vary, apparently from the discs changing their position. This 
cell possibly corresponded to the central cell in fig. 140. — (Surrounding 
the incipient lens, there was forming a membrane, — perhaps the mem- 
brane of the lens. It seemed forming by the coalescence of objects, 
redder and less pale than those in the present figure; and in just the 
same manner as the membrane of the ovisac (fig. 172.). The crystal- 
line and its membrane may perhaps arise, like the ovum and its ovisac, 
from a single corpuscle having the same appearance as a corpuscle of 
the blood (par. 181.)). 
Fig. 140. Tadpole, about 5'". Appearance of a part, probably the centre, of the 
crystalline lens; the lens measuring in diameter The object a 
was dark red ; the branched substance around it, very pale, yet reddish. 
The latter extended, in the same branched form, to the edge of the 
lens. 
Fig. 141. Sheep ; foetus of eight inches. Objects observed in a portion of the cry- 
stalline lens, cut with scissors from the surface. The field of view pre- 
sented a large number of capillary vessels, having a diameter of 
