not in any part to the oxygen of the atmosphere, since the? 
122 : MICROSCOPY. 
- The stroma of which the viscid mass mainly consists appears 
homogeneous in the mammalia, but contains a nucleus in the other 
vertebrata. This nucleus, though undetected by Savory, seems to 
exist in ae fresh corpuscles, and has been detected in blood 
physiological conditions of the animal, and after removal fro! 
circulation it becomes sharply and permanently defined. | 
The usually described forms characteristic of certain classes ® 
animals, are not believed to be the only normal forms. The bl 
of the frog seems to vary at different seasons of the year, and 
ordinary biconcave discs of human blood may be more 
replaced, in fresh and perfectly healthy blood, by the “‘ thorn-a 
and the “single” and “double watch-glass forms.” 
The macula discovered by Dr. Roberts of Manchester ini 
blood of all vertebrata are strangely ignored by most of ther 
authorities, though published many years ago. They are 
verified by the author’s researches. A part of the matter 
posing the corpuscle segregates to form spots, usually one in u 
but often three or four in the frog, which are ordinarily imper 
ble, but which are deeply stained by nitrate of rosanilin, and 
sharp little pullulations under the infuence of tannin. 
the development of these macula is cermin or not § 
be undetermined. 
That the corpuscles are not in the condition simply of à 
ened membrane is shown by the very curious observation 
they will readily float out of the plasma into a drop of oil. 
separated in this manner from the plasma they show a strong Wi 
dency to cohere and thus assume hexagonal forms, just : ef. 
sometimes do when a thin film of blood is dried upon a sli 
The appearance and disappearance of the granulation 
nucleus and other effects demonstrated by Stricker to tak | 
when blood, after contact with aqueous vapor, is exposed i 
: mately. to carbonic acid and atmospheric air, is proved to 
the alternate presence and absence of the carbonic 
_ be replaced in the experiment by hydrogen or other gases 
The action of chloroform and many other re-agents 
corpuscles is studied minutely, but without as yet th 
desired light upon their effects when introduced into t 
