DR. MARTIN BARRY ON THE CORPUSCLES OF THE BLOOD. 253 



like a nucleus was visible at ^. The smaller object is a blood-corpuscle 

 of nearly the size usually met with. It also is, for the most part, in 

 outline. It appeared to be an early state of such an object as the 

 larger one. K Situation of the nucleus. 



PLATE XXII. 



Fig. 104. Ox {Bos Taurus, Linn.) ; foetus of 5 J inches. Nuclei of blood-corpuscles 

 furnished with cilia, and changing their place. Colour blood-red. 

 Two of them in outline, a. Observed in substance cut with scissors 

 from the crystalline lens, while the lens was still imbedded in the 

 vitreous humour; so that a portion of each may have been placed in 

 the microscope. Two days had elapsed since the foetus was taken 

 from the body of its mother, ft. Seen along with a portion of the 

 retina and black pigment, from the other eye. The discs of this cor- 

 puscle appeared to shoot forth a process — the cilium — which then 

 disappeared, as if drawn in. This corpuscle, as well as those at a, 

 crawled about like an insect ; but very slowly. 



Fig. 105. Rabbit (Lepus Cunlculus, Linn.) ; killed two hours, po.?^ coitum. Blood- 

 corpuscles and nuclei of blood-corpuscles observed in fluid taken 

 from vessels in the immediate neighbourhood of a Graafian vesicle, 

 which, from its size and vascularity, had evidently been destined to 

 expel an ovum. a. A group of young blood-corpuscles. /3. Outline of 

 the nucleus of a corpuscle, one of the projections (altered discs) in 

 which, appeared to be in motion, y, y, y, y. Four ciliated corpuscles, 

 — or rather, ciliated nuclei of corpuscles, — of the blood. The cilia 

 seem to be the filamentous extremities of discoid objects, into which 

 the nucleus of the blood-corpuscle becomes divided. Objects such as 

 those at y, were seen very gradually to change their place ; and others, 

 of similar forms, were noticed to revolve; both of these effects seeming 

 referable to their cilia. Examined eighteen hours after death. Among 

 the corpuscles in this figure (and therefore apparently from the interior 

 of a blood-vessel), were many objects of immeasurable minuteness, ex- 

 hibiting molecular motions. These minuter objects had precisely the 

 red colour of corpuscles of the blood, in which they probably had their 

 origin (see par. 167.)- ^- Outline of the nucleus of a blood-corpuscle, 

 composed of discs not terminating in cilia, like those of y. 



Fig. 106. Common Fowl (Phasianus Gallus, Linn.) ; chick in ovo. Young blood- 

 corpuscles observed in the immediate neighbourhood of the object 

 fig. 116J. One of these is in outline. They were blood-red. These 

 young blood-corpuscles, with others of the same kind, were in constant 



2l2 



