250 



Morris Rockstein 



graphically illustrate the data obtained for two sets of ex- 

 periments involving a total of 600 males and 600 females 

 maintained as adults on sucrose and water, as before, and 600 

 males and 600 females maintained on a diet of sucrose, water 

 and powdered whole milk. (The latter is the normal diet for 

 stock breeding adult houseflies.) As is clearly seen in Fig. la, 



o 



o 

 q: 



10 20 30 40 50 

 AGE IN DAYS 



Fig. la. The effect of diet on 

 male houseflies. 



Reprinted from Rockstein and Liebennan (1959), by courtesy the Editor, Gerontologia. 



no appreciable advantages accrued to the longevity of the 

 male houseflies from inclusion of this (high protein, lactose, 

 butter-fat and mineral-containing) adult dietary component. 

 On the other hand, female flies, with a greater longevity than 

 males even under conditions of restricted diet (sucrose and 

 water alone), showed a considerable prolongation of lifespan 

 as a result of including KLIM in the adult food, beginning with 



