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



noticed them to have while within the parent corpuscle. In a good light, these 

 star-like corpuscles are evidently seen to be compound objects, consisting of about 

 half a dozen segments. Each of these segments sends out a cilium ; and it is by this 

 means that the appearance of a star is produced. It is often possible to perceive these 

 star-like corpuscles effecting alterations in their form, slowly revolving, and per- 

 forming locomotion. Thirdly. Besides the two orders of corpuscles now described I 

 have seen a third, of minuter size, apparently arising by division of those last men- 

 tioned ; of which, therefore, they must have been the separated segments. Their 

 motions were extremely vivid, and of such a kind as might be produced by the rapid 

 vibrations of a tail-like appendage or cilium. Such cilium each of them would 

 possess if they arise, as I think they do, by division of the ciliated corpuscles above 

 described. Fourthly. Many corpuscles also, about the size of those last mentioned, 

 are to be seen in the same fluid, of a star-like form. Lastly. There are others, so 

 immeasurably small as to appear as mere points. They have precisely the same co- 

 lour as corpuscles of larger size, and exhibit most vivid motions. — Some of the states 

 now described, I have seen in the blood of the Common Mussel. 



200. Explanation of the Plates. 



PLATE XX. 



Fig. 63. Man. Corpuscles found in fluid having nearly the colour of blood, taken 

 from an abscess. This figure shows the young corpuscle of the blood 

 becoming changed into the pus-globule. See par. 101. for the details 

 of this change. In the objects presented by this figure, proceeding from 

 left to right, a gradual enlargement was observed, as well as a change 

 from the flattened to the globular form ; and those on the extreme 

 right had lost, in some degree, the peculiar tint characterizing the cor- 

 puscle of the blood. (The more or less altered blood-corpuscles in the 

 fluid from which this figure was taken, were observed to arrange them- 

 selves into rouleaux, like those in blood unaltered.) 



Fig. 64. Man. Globules and cells from well-formed pus, after the addition of (a) 

 acetic acid, and (/B) dilute spirit. — a. The largest globule was still sur- 

 rounded by, and eccentric in, an elliptical cell, which is shown in 

 outline. A corresponding cell had perhaps disappeared from around 

 the other globules ; for many such cells were seen in this pus, before 

 any addition had been made. When a cell is present, the pus-globule 

 is the nucleus ; and its eccentric, highly refracting portion, is the nu- 

 cleolus. The pus-globule is composed of elliptical discs ; those form- 

 ing the nucleolus having a high refracting power, after, as in this in- 

 stance, the addition of acetic acid. The nucleolus consists of either a 



