THE HABITS OF CALIFORNIA TERMITES. 63 



gradients had been added but in spite of all I cannot feel per- 

 fectly sure that I have influenced in any unusual way the growth 

 of a single individual. However my experiments along this line 

 are far from being completed and it appears best to hold the 

 account of this phase of the subject for a future time. 



STANFORD UNIVERSITY, CAL., 

 October, 1902. 



