No. 646] 



THE DURATION OF LIFE 



mouth of the bottle, where the ditfusion of air between 

 inside and outside was going on most rapidly. This be- 



DAY5 OF FLY UFE 



is generally a fairly even distribution of flies throughout 

 the bottle, with such tendency towards concentration as 

 there is, in the direction of the bottom near the food 

 rather than the top. 



In Table III are presented the survivorship distribu- 

 tions for the Quintuple flies. Because of their much 

 shorter life span, as shown in the life tables of the first 



