165 



than usual for example, than those of Annraza (Table I.). This 

 irregularity is somewhat more pronounced in the separated records 

 of the type and variety (Table I.) than in their combined statistics. 

 This fact that their combined curve of occurrence is more regular 

 than their separated curves constitutes, to my mind, evidence that 

 we are dealing only with one genetic cycle, and that the variety does 

 not belong to a fully separated genetic series. 



The following table gives the data of pulses and temperatures in 

 the several years. 



PULSES OF BRACHIONUS ANGULARIS INCLUDING VAR. BIDENS. 



It will be noted that all the pulses with one exception lie above 

 70, averaging in fact 78.25, indicating an optimum temperature 



