152 



INFLUENCE OF TEMPERATURE ON BIOLOGICAL SYSTEMS 



Table 1. Weights of fresh eggs and of larvae of oncopeltus 



* Average weights in Mg/individual from lots of usually 200-600, with standard 

 error calculated from variation between samples. Lot no. 1 from fig. 7 A-C; lot no. 2 

 from fig. 7 D; lot no. 3 a single batch of 580 eggs. 



t Approximate values calculated from percentages determined for lot no. 1. 



250- 



3. 





.i 200- 



> 

 < 



175 



,~ 30' 



a. 



U 20 



LlI 



>■ 



< 



Age of Females 



in 



3, 



3 



-o 



a: 



UJ 



> 

 < 



"T — r- 

 5 



-1 — I — I 

 10 



I I 



15 



20 



Days after Last Molt 



Fig. 7. Comparison of weights of freshly laid Oncopeltus eggs {solid circles) with 

 the weights of larvae incubated at 25° (open circles) and 17° (crosses). A. live weights 

 of six lots of eggs and larvae from one lot of parents; B, weights of ether extracts from 

 these; C, weights of dry residues from same; D, repeat experiment with randomiza- 

 tion better controlled by incubating the eggs weighed instead of using separate egg 

 lots for each curve (because of space, data from only first 9 of 20 egg lots plotted here). 



in egg weight as a function of the female's age and treating the separate 

 points as simply so many replicates, one would expect these curves to be 

 parallel. The fact that they are only roughly parallel is at least largely 

 due to individual variation and inadequate randomization of the some- 



