274 ' HARLES G. ROGERS AND ELSIE M. LEWIS. 



That the rate of beat of the dorsal blood vessel of the earthworm is 

 to some extent under the control of the nervous system will be 

 shown in another publication from this laboratory. 



It is to be noted also that the temperature coefficient of the 

 rate of contraction of the dorsal blood vessel of the earthworm is, 

 for the temperatures at which the worm would naturally live, 

 of the same general magnitude as those of chemical reactions, 

 and the average for the whole series, 2.173, a l so f a ^ s within the 

 limits usually set for the temperature coefficients of such re- 

 actions. We have no reason, as yet, to assign for the much 

 reduced coefficients for the higher temperature ranges. 



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Loeb, Jacques and Ewald, W. F. 



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