DR. MARTIN BARRY ON THE CORPUSCLES OF THE BLOOD. 263 



Fig. 151. Sheep; foetus of six inches. From the edge of the crystalline lens. Por- 

 tion of the tube filled with corpuscles having the appearance of altered 

 and enlarged blood-corpuscles. In outline. These corpuscles exhibited 

 a brilliantly pellucid object in the situation of the original cavity or 

 depression. In some instances, this pellucid object seemed double. 

 The surrounding part of the corpuscles was blood-red. 



Fig. 152. Ox; foetus of eighteen inches. From the edge of the crystalline lens. 

 Portion of a tube filled with corpuscles having the appearance of blood- 

 corpuscles in greatly enlarged and altered states. (See the descrip- 

 tion of fig. 142.) a, |3. Several of the many pellucid spaces, occupying 

 the situation, apparently, of the original cavity or depression in the 

 corpuscles. Some of these spaces were very minute ; and others, |3, 

 so large, that they seemed to have resulted from the coalescence of 

 several smaller ones. By degrees, indeed, the tube may thus become 

 colourless in its whole diameter ; the red colouring matter, y (which is 

 situated between the pellucid spaces), having disappeared. The figure, 

 which is chiefly in outline, represents the red colouring matter only at 

 the upper part (y) ; where a trace is seen of the division between the 

 corpuscles. I. There is visible in some of the pellucid spaces, a minute, 

 highly refracting object, apparently an orifice, which at I, J, seemed to 

 communicate with the exterior of the tube. g. Outline of corpuscles 

 having the same appearance as young corpuscles of the blood, observed 

 with the foregoing. One of these, it will be seen, did not exceed g^'" 

 in length. 



Fig. 153. Sheep; foetus of six inches. From the crystalline lens. Outline of pale 

 cells. One of them was seen to be filled with discs, which also are 

 represented in outline. 



Fig. 154. Ox; foetus of ten inches. From the crystalline lens. Pale cells, for the 

 most part in very early stages of formation, and exceedingly minute. 

 The cells are in outline, except their nuclei, a few only of which (nuclei) 

 have been delineated. In many of the cells, however, a nucleus was 

 not discerned. And this indeed was in most instances the case. a. Ob- 

 jects composed of discs. The outer portion (exceedingly minute discs) 

 of such objects appears to separate from the rest, to form the mem- 

 brane of a cell ; the remainder being the nucleus of the cell. |3. The 

 cell-membrane formed, y. Nucleated cells more advanced. The other 

 cells in this figure are in outline. Some of them, ^, are arranged in 

 rows ; which was observed in many instances to be the case. Cells even 

 of the minuteness of those in this figure, often seem to contain discoid 

 objects ; especially if the nucleus has disappeared. 



Fig. 155. Ox; foetus of eighteen inches. From the edge of the crystalline lens. 



