108 



THE FROG 



CHAP. 



Fir,. 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 ; D, their nuclei ; E, pigment-cells ; F, red corpuscles ; G, H, red corpuscles 

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

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



