CONSTANT DIFFERENTIAL GROWTH-RATIOS 29 



Animal 



Mealworm, Tenebrio 

 molitor larva 



Wax-moth, Galleria mell 

 onella, larva 



y = organ 



x = standard to which 

 organ is compared 



total fat 



fat 



phos- 

 phos- 



growth 



1-07 

 i-o6 

 1-04 



i-oi 

 1 00 

 098 



103 0-975 



(i-o8 1-02) 



about o-8 



about 0-9 



total carbon 



dry weight 



dry weight, 

 removed 



total phosphorus, 

 until late in lar- 

 val life 



(total phosphorus, 

 end of larval 

 life) 



protein nitrogen 



fresh weight 



total water 



total nitrogen 



extractives 



lipidic 

 phorus 



nucleic 

 phorus 



ash 



total heat of com- 

 bustion 



Oxygen consump- 

 tion at rest and 

 fasting 



Oxygen consump- 

 tion under nor- 

 mal conditions, 

 but on a ration 

 permitting only 

 slow 

 (flour) 



ditto, but fed a 

 ration permit- 

 ting normal 

 growth 



total water, early 

 phase* 



total water, late 

 phase 



dry weight, early 

 phase 



dry weight, late 

 phase 



total heat of com- 

 bustion, early 

 phase 



late phase ' refer to the fact that after a period 

 of regular differential growth lasting for most of the larval period, there 

 occurs a short phase of irregularity, denoting rapid change in character of 

 metabolism, followed by a second regular period resembling the first but with 

 different quantitative relations. 



Value of k 



(«) (b) 



fresh dry 

 weight weight 



(a) 

 i-i3 



(b) 

 i-o6 



about 0-95 



10 



i-o 



0-96 0-91 



i-o 



i-oS 



i-i3 



i-o 



i-o 



I-OQ 



Early phase ' and 



