TEOPICAL NIGHT-SOUNDS. 29 



alternation ; and between their notes, there was the differ- 

 ence of exactly a musical tone. 



Darwin speaks of the nocturnal sounds at Eio Janeiro : 

 — " After the hotter days, it was delicious to sit quietly in 

 the garden, and watch the evening pass into night. 

 Nature, in these climes, chooses her vocalists from more 

 humble performers than in Europe. A small frog of the 

 genus Hyla \i. e., of the family Hyladce, the tree-frogs 

 already alluded to], sits on a blade of grass about an inch 

 above the surface of the water, and sends forth a pleasing 

 chirp ; when several are together, they sing in harmony 



on different notes Various cicadse and crickets at 



the same time keep up a ceaseless shrill cry, but which, 

 softened by the distance, is not unpleasant. Every even- 

 ing, after dark, this great concert commenced ; and often 

 have I sat listening to it, until my attention has been 

 drawn away by some curious passing insect.'' * 



Edwards, in his very interesting voyage up the Amazon, 

 heard one night a bell-like note, which he eagerly con- 

 cluded to be the voice of the famed bell-bird. But on 

 asking his Indian attendants what it was that was 

 " gritando," he was told that it was a toad, — " everything 

 that sings by night is a toad ! "" 



I doubt much whether the voice first referred to in the 

 following extract ought not to be referred to tlie same 

 rejptilian agency: — 



" During our ride home, [in Tobago,] I was startled by 

 hearing what I fully imagined was the whistle of a steam- 



* Naturalist's Voyage, (cd. 1852,) p. 29. 



