BLOOD CORPUSCLES. 



95 



have a dotted appearance. It is not so easy to distinguish 

 the two kinds of corpuscles as in the case of the frog's blood 

 for the two kinds are more nearly of the same size in the 

 human blood ; and, further, when the colored corpuscles of 

 human blood are seen flatwise they present a circular out- 



White Corpuscles 



White Corpuscle 



MODERATELY MAGNIFIED 



Fig. 36. Red and White Corpuscles of the Blood. 

 | 



line, while the frog's colored corpuscles are elliptical. But 

 with a little study the two may be distinguished. As in the 

 frog's blood, the colorless corpuscles have ameboid movements, 

 though they are not very marked unless the blood be warmed 

 to about the temperature of the human body. 



The blood is composed of a clear liquid, the Plasma, and 



