150 



INFLUENCE OF TEMPERATURE ON BIOLOGICAL SYSTEMS 



10 20 

 I I 



30 

 I 



40 50 60 70 80 

 I I I I I 



90 too 110 



I 



A 



B 

 C 

 

 E 

 F 

 G 

 H 

 I 



J 

 K 

 L 

 M 

 N 

 

 P 

 Q 

 R 

 S 



U 

 V 



w 



X 



Y 



-» 



AA 

 BB 

 CC 

 OD 

 EE 

 FF 

 GG 

 HH 

 II 



^^^^^— ^^H^^^^^^^^^^^^^^^^^^^^^^^H 



10 20 30 40 



I 



50 



60 



I 



70 



80 



r 

 90 



I 



% DIED 

 PRIOR TO 

 HATCH HATCHING HATCHING 



% 



% DIED 



100 



I 



no 















40^ 4 



ISA 3 



6S 



9± 2.6 



2.5^1.3 



43 ± S 



7.5 ± 2 



44i: 7 



40^ 6 







5±2 



18^8 



75^4 



60± 6 



79^4 



89^3 



89^ 3 



94± I 



90^ 3 



88* 3 



96^ 2 



92*4 



98^3 



94*3 



96*2 



60 



31 







88 







2 * I.S 



90-96 





 FEW 

 FEW 



13.5 



IS 



6.5 

 6 



40 

 38 

 28 



5 

 5 



18 

 II 

 17 

 6 

 3 

 5 

 

 

 

 



I 



I 





 



FEW 



4 

 



7 

 



100 

 MOST 

 MOST 

 46.5 



70 



85 

 91 

 17 

 SS 

 28 



95 

 90 

 64 



14 

 23 

 IS 



8 

 6 

 6 

 10 



le 



4 

 T 

 4 

 6 

 4 



MOST 



8 

 100 

 91 

 4-10 



PER CENT DEVELOPMENTAL TIME 



Fig. 5. Diagrammatic presentation of data demonstrating absence of a 'sensitive 

 period' for the deleterious effect of low temperature on Oncopeltus eggs. The time 

 scale is 'developmental time,' i.e. actual time X developmental rate at that tempera- 

 ture. Each line is a separate experiment. Open bars: per cent developmental time at 

 the subthreshold temperature of 14°; solid bars: per cent developmental time at the 

 favorable temperature of 20° or 25°. Modified after Lin ct al., 8. 



