12 FAMILIAR LIFE IN FIELD AND FOREST. 



have they the same nBging, sleigh-bell quality. The 

 tone is also of a much lower pitch, and it very 

 slightly approaches in quality the bleating tone of the 

 tree toad. 



According to Professor Cope, this frog is com- 

 mon in Gloucester County, N. J., and Chester Coun- 

 ty, Pa. ; but since the time in which he wrote (1889) 

 I am inclined to think that the frog has found his 

 way farther to the northeast, and he ought to be 

 heard now in Staten Island and the vicinity. I have 

 certainly heard his voice in the pine barrens not far 

 from Lakewood, N. J. 



I can not sufficiently emphasize the fact that 

 every species of living thing has its own particular 

 voice. When once we have heard a single Picker- 

 ing's Hyla, we have heard the characteristic voice of 

 that species, and it is not to be confused for one 

 moment with that of any other species. The com- 

 mon frog's droning note can not be mistaken for the 

 rattling note of the Chorophilus, or the ringing, 

 jingling note of the Acris ; nor is the quality * of 

 the note of any one of these species I have named 

 like that of the bubbly-bleaty note of the tree toad. 



* This, in music, we call " timbre." When I change my tenor 

 voice and sing a falsetto note, and thus imitate the soprano voice, 

 I have altered tlie timbre of the note ; although it may still be A, 

 its quality is no longer the same. 



