BED BLOOD-CORPUSCLES. 4T 



SPHEROIDAL CELLS. 



The only cells which have, in any very great number, retained their 

 primitive spheroidal form are the corpuscles of the blood and of the- 

 lymphatic system. 



In solid organs, the cells, primarily spheroids, often become poly- 

 hedral from pressure. 



Cells, developed spheres, not unfrequently send out prolongations, 

 forming either stellate or polar cells according to the size of the radi- 

 ating processes. 



RED BLOOD-CORPUSCLES. 



The human red blood-corpuscle is a flattened, bi-concave disc, one- 

 three thousand two hundredth of an inch in diameter. It presents a. 



FIG. 31. CORPUSCULAR ELEMENTS OF HUMAN BLOOD. 



A. Colored corpuscles adhering by their sides rouleaux. 



B. The same crenated. 



C. The same shrunken. 



D. The same having absorbed water. 



E. The same still more swollen. 



F. The same with the plane C D, Fig. 32, in focus. 



G. The same with the plane A B, Fig. 32, in focus. 

 H. Colorless corpuscles, x 400. 



mass of protoplasm destitute, as far as the microscope shows, of nuclei,, 

 cell- wall, or any structure whatsoever. 



