A PORTION OF THE BULLFROG GROUP 



Two frogs are engrossed in a chickadee on the birch branch al)ove. The smaller frog seems likely 

 to fall a prey to a black snake ready to strike from the white azalea near 



The water of tlie group is a tightly-stretched transparent sheet of celluloid. The ingredients 

 were mixed at the Museum according to a formula wliich gives a less brittle product than the com- 

 mercial celluloid and the sheet was made by flowing this liquid on glass in layers one over the other 

 202 



