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 j3. 



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 g-oo'" 



