526 DISEASE IN WILD MAMMALS AND BIRDS 
Conditions Which Modify the Temperature. 
Observations by A, E. Bro^\^l (4) and by Simpson and 
Galbraith (5) would seem to indicate that the diurnal vari- 
ation in monkeys is due to periodicity of activity. Doctor 
Brown found that the temperature of a night monkey is 
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Chabt E. Compoaite chart of seventeen non-tuberculous Macacue. 
reversed, that it is higher during the dark than the day- 
light hours. See chart of Potto {Perodictus potto) chart 
L. The Scotch observers report that if the activity of 
day monkeys were reversed, daytime being made artifi- 
cially dark and acti\ity forced during the night, the tem- 
perature curves were likewise reversed. 
(4) A. E. Brown, Proc. Loiidon Zool. Soc, June, 1909, p. 81. 
(5) Simpson and Galbraith, Trans. Royal Soc, Edinburgh, XIV, p. 1, 
65, 1906. 
