The Biology of Ageing in Insects 



251 



the second week of life (Fig. lb). As can be seen from Table I 

 (reprinted from Rockstein, 1957), the mean longevity for a 

 total of 600 female flies maintained on the enriched diet was 

 about 31 days, in contrast to a mean value of about 19-5 days 

 for females maintained on sugar and water alone. Moreover, 

 the maximum longevity for females on the KLIM-enriched 



CO 

 Uj 



—I 

 < 



Uj 

 U. 



>■ 



o 



Uj 

 U 



q: 



10 



20 30 40 50 

 AGE IN DAYS 



60 70 



Fig. lb. The effect of diet on female house- 

 flies. 



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



diet was about 30 per cent higher than for females on the 

 restricted diet. 



These results are in direct contrast to the well-known 

 findings of McCay and his co-workers (1935, 1939, 1941) that 

 restricting the dietary intake immediately or soon after weaning 

 retarded the growth of male rats and concomitantly extended 

 the average lifespan from 483 to 894 days (and maximum 



