Circulation of the Blood, in Stickleback and Frog. 



Plate 8. 





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



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



5. Capillaries in web of Frog's foot, magnified 580 diameters. 



