Circulation of the Blood, in Stickleback and Frog. 



Plate 8. 



1. Stickleback. 2. Small portion of Stickleback's tail-fiu. magnified 35 diameters. 



3 I'art of Frog's foot. 4. Minute portion of the web, magnified 100 diameters. 



o. Capillaries in web of Frog's foot, magnified 5SO diameters 



