A.MPnimA 



31, 



tlit'se (lata will (Muil)l(' a coninmiiitv to i^iv(* efToctivc protfc- 

 liun lu \ aluablu sprcius. Frogs and loads proclaim this sea- 

 son, each species Avith its own jx-culiar note fi-om the earliest 

 shrill whistles of the s[)ring [)eepers, and tlic croaks, clucks, 

 trills, and warbles of the frogs, toads, and tree frogs, to the 

 bass-viol />/'-friniis and Ju//-o-n(/ns of the bullfrogs in late 

 June and early July. 'J'he i^gg^ are most interesting forms 

 with which to follow endjryological dev(dopment. and their 

 numbers indicate possi- 

 bilities of increasing val- 

 uable species, when we 

 learn to provide favor- 

 able conditions. The 

 toads' eofo-s are found in 

 strings ; the green frogs' 

 and bullfrogs', in loose, 

 floating films ; the wood 

 frogs', leopard frogs', and 

 pickerel frogs', in globu- 

 lar masses of jelly ; and 

 the peepers', shigle or in 

 small clusters. Ol^serva- 



Fki, 140. Toad tadpoles as sca\ f iigers, eat- 

 ing dead pout at margin of pond 



Photograph hy Newtou Miller 



tions by the class may yield a table for local s[)ecies some- 

 what like the one shown on the following page. 



The feeding test. Ani[)hil)ia afford most convenient ani- 

 mals with which to study foods and feeding hal)its. Imitate 

 natural habitats in the arrangement of terraria and a(iuaria — 

 moist earth, moss, or sod for toads, wood frogs, and land 

 salamanders, with a forked branch and a small pool for tree 

 frogs, and a larger pool, with a bank of nntss at one end. for 

 aquatic frogs and salamanders. Then, for the tests, introduce 

 all sorts of insects, spiders, millepeds, crustaceans, slugs, and 

 worms, countincr the numbers and kinds eaten. Xo single 

 laboratory exercise shows so convhicingly the vahu' ot the 



