DR. MARTIN BARRY ON THE CORPUSCLES OP THE BLOOD. 251 



had been formed by portions previously given off in this manner from 

 the centre S. The object now described, on the right hand in tfie 

 figure, was lying on the crystalline. I have seen similar objects in the 

 choroid. The mode of origin of the partitions ^, just described, is 

 precisely analogous to that of the partitions in fig. 89, from the tail. 



Fig. 94. Tadpole, about 6'". a. Outline of a cell, filled with young epithelium-cells. 

 This cell was red throughout. The cells which it contained, presented 

 indications of further division, as seen by the one somewhat more 

 finished, in delineation, than the rest. And at the left side, one of these 

 young cells was broken down into cells or discoid objects of extreme 

 minuteness. /3. Two epithelium-cells, of a blood-red colour, except at 

 the lower part, where they had become quite black. (Acetic acid.) 



Fig. 95. Tadpole, about 6'". Blood-corpuscles, apparently forming epithelium. 

 All of these contained discs or incipient cells, which, generally speak- 

 ing, had a deeper red, the nearer they were to the centre of the enlarg- 

 ing nucleus. The nucleus increased so as nearly to fill its corpuscle. 

 In a, it consisted of a central portion, composed of four cell-like 

 objects ; and of two parts, concentrically arranged around these. 

 |3. The corpuscle is in outline. Four cell-like objects were seen within 

 it, each of which was filled with discs. (Acetic acid.) 



Fig. 96. Tadpole, 5'". Epithelium-cell, having very much the appearance of an 

 altered corpuscle of the blood. At )3, it was nearly black ; at most 

 other parts, blood-red. Discs were seen, with more or less distinct- 

 ness, at nearly all parts. At a, the surface was membranous; and 

 internal to this portion of membrane, the substance was of a pale red, 

 and free from the very highly refracting globules so numerous elsewhere 

 in this object. At a certain part, is seen the nucleus ; pale in colour, 

 and in some degree pellucid. It presented discs. 



Fig. 97. Tadpole, 5'". An object entering into the formation of the epithelium, 

 and for the most part blood-red. The eccentric nucleus exhibited a 

 nucleolus, having apparently a peripheral situation. This nucleolus 

 seemed to be an orifice, possibly communicating with the exterior. 

 (Tincture of iodine.) 



Fig. 98. Tadpole, about 5"'. Incipient epithelium-cylinders. Colour red, passing 

 at the large extremity almost into black. Some of the discs composing 

 the object a, were in motion, effecting changes in their form : and 

 the object very slowly revolved on its axis, in the direction of the 

 arrow. |3. The same object, as viewed about half an hour after it pre- 

 sented the appearance at a. Its form was different. This may have 

 arisen partly from a change in its direction,— the part which is pointed 

 in j3, having possibly been, in the condition a, directed towards the 



MDCCCXLI. 2 L 



