JOSEPH KRAPKA, JR. 



427 



t3^e of curve. He has demonstrated the straight line curve in the rate 

 of CO2 production by Tenehrio larvae. Sanderson, Headlee, Peairs, 

 and many others have shown that all the various phases of insect 

 metaboHsm investigated follow this principle. Lehenbauer, as the 



0.075 



0.050 



Q025 



15** 20° 25° 30° 



Temperature 



Fig. 9. Temperature effect on the length of the immature stages (egg, larval, 

 and pupal) and on the rate of development. The curve that starts at the top to 

 the left represents the number of days from the mating of the parents to the 

 emergence from pupation of the offspring. The reciprocal represents the percent- 

 age of total development completed in 1 day. 



most recent worker on rate of plant growth, has shown the same rela- 

 tions for maize seedlings. An examination of many curves dealing 

 with the effect of temperature on the rate of growth and the degree 



