loS 



THE KROG 



FlU. 27. — Thtj clrculatiun In tlnj frog'b wx-h, uiidci- .1 high power. 

 A, wall of capillaries ; B, tissue of the webin which the capillaries lie ; C, epidcrin 

 cells ; V, their nuclei ; /:, pigment cells ; F, red corpuscles ; G, //, red corpuscles 

 betni;; squee/ed through a narrow capillary; A', capillary seen through the 

 epiderm ; /, colourless corpubcles. (From Huxley's I'/iysioio^y.) 



