SCOPE OF GENETICS 25 



questions with which only a cytologist can 

 deal, and often it is the experience of a 

 systematist we must invoke. The school of 

 Genetics in Cambridge starts under happy 

 auspices in that we are surrounded by col- 

 leagues qualified, and as we have often found, 

 willing to give us such aid unstinted. But 

 with chemical physiology, we stand in an 

 even closer relation; and fi'om the little I 

 have dared to say respecting the action and 

 interaction of factors, it is evident that for 

 their disentanglement there must one day 

 be an intimate and enduring partnership 

 arranged with the physiological chemists. 



Now, as the whole of the elaborate process 

 by which the various elements are appor- 

 tioned among the gametes must be got 

 through in a few cell-divisions at most, and 

 perhaps in one division only, it is not sur- 

 prising that there is sometimes an interaction 

 between factors that have quite distinct roles 



