310 



MANUAL OF PHYSIOLOGY. 



In looking at the blood passing through the small vessels of a 

 transparent tissue, such as the frog's tongue or web, it appears 



FIG. 142. 



Sinjill portion of Frog's Web, very highly magnified. (Huxley.) A. 

 Wall of capillary vessels. B. Tissue lying between the capillaries, c. Epi- 

 thelial cells of skin, only shown in part of specimen where the surface is in 

 focus. D. Nuclei of epithelial cells. E. Pigment cells contracted. F. ll'l 

 corpuscles (oval in the frog), o. H. Red corpuscles squeezing their way 

 through a narrow capillary, showing their elasticity. I. White blood cells. 



