DR. MARTIN BARRY ON THE CORPUSCLES OF THE BLOOD. 
257 
the part was more advanced, the surrounding globules had very much 
disappeared ; and the corpuscles were in polyhedral forms. 
Fig. 124. Tadpole, about o'". Corpuscles having precisely the same appearance as 
blood-corpuscles, passing into the elements of the optic nerve. Taken 
from various parts of a fasciculus of incipient fibres in the immediate 
neighbourhood of the eye-ball, which the fasciculus was seen to enter. 
a. The corpuscles in question arranging themselves in a line. These 
are all in outline except one. Immediately within their membrane 
was red colouring matter. This surrounded a pale globular object 
(nucleus), in which were discs. In the red colouring matter, there 
were seen very minute globules, having a high refracting power. These 
were of a brilliant red colour. Many of them appeared to be under- 
going division. They presented the appearance of a rose. These 
globules occupy the situation of such as are seen, in many instances, to 
exhibit molecular motions in corpuscles of the blood. — All the other 
objects in the figure were composed of discs ; and all were red, the 
colour becoming paler in the more advanced. 
Fig. 125. Tadpole, about 7'"- Portions of the optic nerve, forming out of corpus- 
cles having the same appearance as corpuscles of the blood. Quite 
red. Almost entirely in outline, a. The discs into which the nuclei 
of the said corpuscles had passed, were arranging themselves in some- 
thing like lines ; and they presented discs in their interior, as in the 
more finished disc of this object. j3. From a part of the same nerve, 
more advanced. This object is a tube, at the periphery of which there 
were seen discs coalescing. These discs presented discs in their inte- 
rior, corresponding apparently to the minutest of those in the object a. 
Pellucid points, apparently orifices, were seen here and there ; and they 
seemed to communicate with the exterior of the incipient tube. (Dilute 
spirit.) 
Fig. 126. Ox; foetus of eighteen inches. From the retina. Two corpuscles having 
the same appearance as corpuscles of the blood, a. But little changed. 
( 6. Orange-shaped ; a large orifice in the situation of the original de- 
pression (which existed when the corpuscle was a disc). Two pellucid 
points on one side (par. 154.). (Dilute spirit.) 
Fig. 127- Ox ; foetus of ten inches. From the retina. Two altered corpuscles 
having the same appearance as corpuscles of the blood, a. The orifice 
is very large; but single. (3. There exist two orifices (par. 154.). 
Fig. 128. Sheep ( Ovis Aries , Linn.) ; foetus of eight inches. Corpuscles having the 
same appearance as corpuscles of the blood, passing into globules for 
the formation of the retina. See the description of fig. 130 ; the letters 
denoting similar objects in both figures. 
