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 «, were very indistinct. In the state (3 , they were 
well defined, and presented the appearance of little cylinders : which 
appearance was noticed also in the paler part of (3. 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. c>. 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. (3. 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%"'. 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 (3. 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 
