PHYSIOLOGY OF WING DEVELOPMENT IN APHIDS. 



101 



The following is the summary of the foregoing data. 



Winged Individuals. 



AgNOj 51 



CuSO 4 34 



HgCl 2 31 



NiSO 4 955 



SbCb 41 



PbCla 12 



SnCl 4 579 



ZnCh 49 



Mg salts 840 



Sugar 512 



Alcohol 288 



Alum 3 



Acetic acid o 



Na salts 2 



Ca salts . . i 



K salts 3 



Sr salts 



Tannin 



Urea 



Water, distilled . 



I 

 I 



5 

 o 



Water, tap and creek 17 



Peptone 



Apterous 

 Individuals. 



I 

 6 



5 

 5 



2 



8 



2 



9 



4 



2 



34 

 67 



1029 

 433 

 324 

 220 



14 

 153 

 394 

 461 



IS 



ing qualities. Only a few drops of the normal solutions of these 

 salts were added to the 5 c. c. of distilled water, in most of my 

 experiments. 



