The Influence of Environment 295 



to attempt to decide what the chemical reaction under- 

 lying these reaction velocities is (if it is a chemical 

 reaction). Loeb and Wasteneys 1 investigated the 

 temperature coefficient for the rate of oxidations in 

 the newly fertilized egg of Arbacia and found that the 

 temperature coefficient Q I0 for that process does not 

 vary in the same way as the temperature coefficient 

 for cell division. 



TABLE XI 



Temperature Coefficients Qi for the Rate of Segmentation 



and Oxidations in the Eggs of Strongylocentrotus 



and Arbacia 



It is obvious that the temperature coefficient of 

 the rate of oxidations is remarkably constant, about 

 2 for io°, for various temperatures and does not show 



1 Loc. cit. 



