U. S. B. F.— Doc. 



Plate XIII. 



FIG. 1.— A SURFACE FILM OF BULLFROG EGGS ATTACHED TO THE TIPS OF 

 ELDERBERRY BUSHES. 



^ 



FIG. 2.— Af-I EGG AREA OF LEOPARD- 

 FROG EGGS. THE EGG MASSES ON 

 THE BOTTOM OR ATTACHED TO 

 VEGETATION. 

 (After Wright. Carnegie PuLI. No. 197.) 



FIG. 3.— A SURFACE FILM OF GREEN- 

 FROG EGGS AMONG VEGETATION. 



(After Wright. Carnegie Publ. No. 197.) 



