364 



H. G. MAY. 



I6f 1-6 



cotton and in case of the long-winged race contained pieces of 

 filter paper to prevent the flies from adhering to the food. 



Throughout these experiments bananas were used as food. 

 Only specimens with perfect skin were selected. The pulp was 

 never allowed to come in contact with the outside of the skin 



(f5) f4- 

 (f4) f3- 



(O) f2- 



(f2) fl- 



(fl) 



Stock 



(fl) 



(f2) 



(f3) 



(f4) 



U5) 



fl-5 



fl-4 fl-10 fl-16 



I 



i 



f2-J> 



f4-3 



f4-5 f4-12 



FIG. i. Relation of selected lines and stock in VBa. In general the down- 

 ward selected lines are below and the upward selected lines above. 



and was heated to 70 C. and allowed to cool in a closed vessel 

 before being placed into the food jar. Food was allowed to 

 undergo alcoholic fermentation for about three days before 

 being used. At first the author had considerable difficulty in 

 keeping food, as acetic acid fermentation soon set in, the food 



