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



observer. But it appeared that some alteration had really taken place 

 in the form. A further change was noticed. The discs of the dark 

 part in the condition a, were very indistinct. In the state ^, they were 

 well defined, and presented the appearance of little cylinders : which 

 appearance was noticed also in the paler part of j3. Motion not ob- 

 served in the condition /3. y. State rather more advanced. The 

 nucleus presented an orifice, having the appearance of a rent or fissure. 

 The red colour was very deep. h. Two of the appearances presented 

 by a minute and isolated disc which was in motion, — changing its form 

 and place. 



Fig. 99. Tadpole, 5'". An object, which was apparently an epithelium-cylinder, 

 about to undergo longitudinal division. It contained two nuclei ; one 

 in a more advanced state than the other. Each of these was composed 

 of discs, situated in concentric order around a space representing the 

 nucleolus. This object was blood-red. (Tincture of iodine.) 



Fig. 100. Tadpole, about 5'". More advanced state of a corresponding object. 

 The two nuclei pale. The surrounding part blood-red, passing nearly 

 into black at some parts, especially at the lower end. 



Fig. 101. Tadpole, about 5'". Outline of portions of ciliary processes ; the parts 

 composing them having the same appearance as corpuscles of the 

 blood. 



Fig. 102. Duck. a. A cell observed lying among blood-corpuscles taken from the 

 surface of the yelk, in an egg incubated five days. It had the same 

 colour as the corpuscles of the blood. The membrane of this cell was 

 of extreme delicacy. It contained a pale yellow substance, in which 

 were globules, yellowish in colour, highly refracting light, and in vivid 

 molecular motion. These motions were not observed when the cell 

 was first seen ; at which time, also, the contained globules were in 

 closer approximation than the figure shows. Possibly the cell was 

 ruptured while under examination, (i. Similar globules, myriads of 

 which were seen loose in the same field of view. Their molecular 

 motion was most vivid, and attended with constant and considerable 

 change of place. 



Fig. 103. Tadpole, 4 J"'. The larger object is a blood-corpuscle, and contents, for 

 the most part in outline, very much enlarged. The interior presented 

 globules resembling those of fat. These globules appeared to occupy 

 the situation of the central part of what had previously been discs. 

 Compare the disc a, and its centre, with apparently corresponding 

 objects at f3. The corpuscle exhibited redness at all parts, but chiefly 

 on the side y, — where, here and there, it was very dark, — though this 

 appearance has not been at all represented in the figure. Something 



