STEFAN KOPEC. 



essential change in this experimental material. (The pupae are 

 here even heavier, but the differences are smaller than their 

 fourfold error.) 



THE OFFSPRING OF CONTROL FEMALES MATED WITH MALES 



SUBJECTED TO STARVATION. 



As the control females mated with starved males were by 

 chance mostly larger than the control females mated with control 

 males, they laid somewhat larger quantities of eggs (Table I.). 

 The egg size, however, was identical in this material and in that 

 of the control, as may clearly be inferred from Table II. Also 

 in this experiment the percentage of eggs which did not develop 

 at all Was not larger than i per cent, of all eggs. 



An exact inquiry into the data of Table I. shows that the capac- 

 ity of the spermatozoa from starved males to fertilize and to 

 timulate eggs to total development is, if not larger, at least nots 

 smaller than in spermatozoa of control specimens. On the other 

 hand, mortality of caterpillars as well as of chrysalids in this 

 experiment was undoubtedly larger than in control materials. 

 From data of Tables III. and IV. we see that the larval life in tfie 

 offspring of control females mated with males subjected to inani- 

 tion does not undergo any essential change. On the other hand, 

 the duration of the pupal stage is essentially shortened in this 

 experiment. On comparing the data of the same tables it is also 

 found that in contrast to the offspring of starved females mated 

 with control males, the offspring of males subjected to starvation 

 and of control females is lighter than the progeny of control 

 material. 



GENERAL CONCLUSIONS AND SUMMARY. 



The above experiments are the first to discriminate strictly the 

 influence of starvation exerted on the offspring by either of the 

 parents separately. The starved females the progeny of which 

 was used for this research were much smaller than the control 

 specimens, their limit, of growth being only 48.4 per cent, of the 

 normal limit of growth (Kopec, '21 and '23, Table III.). Never- 

 theless, the body-weight of the offspring of such starved females 

 was at least normal. This leads to the supposition that in females 

 hunger metabolism does not bring about any quantitatively 



