16 STEFAN KOPEC. 



that the chrysalids of series D which have been deprived of food 

 only during the half of their larval life are lighter than those from 

 series A the caterpillars of which have been starved during their 

 whole larval life. From Table III. we see that the male pupa 1 

 from series D weighed in the average of broods 48.5 per cent., 

 the female pupa? 48.4 per cent, of the average weight of the con- 

 trol chrysalids, whilst the male chrysalids from series A weighed 

 as much as 70.2 per cent., the females 78.3 per cent . 



As the prolongation of the larval period was much greater in 

 series A than in series D (cf. Table I.), it might be supposed that 

 the caterpillars of series A are heavier owing to the circumstance 

 that they lived longer, and therefore could take and digest food 

 during a longer period. But the following argument contradicts 

 this opinion. At the outset of the experiment in series D the 

 caterpillars weighed in the average of broods 94.5 nig., the male 

 specimens underwent pupation in the average of broods after 

 26.1, the female after 29.7 days. If we take as starting point for 

 series A the day on which the caterpillars of this series had an 

 analogous weight, which in the average of broods amounted to 

 93-5 m -> the duration of larval life in this series from this day 

 till pupation was in the average of broods 27.6 in males and 36.2 

 in females. We see that when the starting point had been made 

 uniform the duration of farther larval life in series A, especially 

 in males, is almost identical with that in series D. In other words, 

 the specimens of series A attain considerably greater weight than 

 those of series D during approximately the same period. The 

 ratio of the produced number of milligrams of body-weight to 

 the total number of days of the period during which the larvae 

 had been deprived of food being considered as rate of growth, we 

 may calculate that the rate of growth amounts in the average 

 of broods in series A to 7.4 in starved males and to 19.8 in females, 

 whilst in series D this quantity attains only 4.5 in starved males 

 and 15.8 in females. It follows that the starved organism may 

 in time get accustomed to the metabolism of inanition, i.e., the 

 ratio of assimilation to disassimilation becomes during lon;^ 

 starvation changed in favor of the organism. 



By histological research I have convinced myself that cater- 

 pillars which died from starvation contain no adipose tissue. In 

 a certain contrast to my observations, Bialaszewicz ('19) draws 



