936 THE AMERICAN NATURALIST. [VoL, XXXIII. 
Degrees Fahrenheit A few years ago a note 
g 3 appeared in the Boston Tran- 
script calling attention to the 
very exact dependence of the 
rapidity of the chirps upon 
the temperature of the sur- 
rounding atmosphere and giv- 
g ing a formula therefor. 
\ In the American Naturalist 
E for 1897, p. 970, may be found 
= a brief article, by Professor 
A. E. Dolbear, also giving a 
ts formula, possibly the same. 
x Professor Dolbear makes a 
\t claim for synchronism among 
` many individuals which I have 
not observed, and attributes 
A the phenomenon which he 
notes rather to the influence 
At of temperature upon the 
y whole orchestra than upon 
each performer. He says: 
PA “ An individual cricket chirps 
\ with no great regularity when 
by himself, and the chirping 
$ \ is intermittent, especially in 
il the daytime. At night one 
N may hear all the crickets in a 
field chirping synchronously.” 
It seems to me that he may 
Wa have been deceived by observ- 
\ ing two different species, for 
the tree cricket does not say 
\ much in the daytime, but I 
have certainly located the 
noise so closely, within a few 
feet, that I am sure that only one insect was concerned in mak- 
ing it, and it lasted with perfect regularity within several minutes. 
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