io8 



THE FROG 



FIG. 27. The circulation in the frog's web, under a high power. 

 A, wall of capillaries ; B, tissue of the web in which the capillaries lie ; C, epiderm- 

 cells ; JD, their nuclei ; , pigment-cells ; F, red corpuscles ; G, ff, red corpuscles 

 being squeezed through a narrow capillary ; K, capillary seen through the 

 epiderm ; /, colourless corpuscles. (From Huxley's Physiology.) 



