440 



LORANDE LOSS WOODRUFF. 



"The five-day period was adopted in the presentation of 

 our results because this was the method of constructing the 



tf"Ti 



AE 



JL 



fb 



o 



10 



FIG. i. 



4 



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graph emphasized in the original study of rhythms in this 

 culture. 1 It is realized, of course, that a five-day period is 



i Woodruff and Baitsell, Journ. Exper. Zool., XI., i, 1911. 



