170 CLYDE M. HAMILTON. 



CHART II. 



Graph 8 shows the control of anEvarthrus sodalis larva in still air at a temperature 

 of 23 C. at the start and 26.5 C. at the end. 



Graph 9 shows the reaction of an Evarthrus sodalif lar\a to an air flow of 13.3 

 liters per minute at a temperature of 22.5 C. Relative humidity of air, wet 54 

 per cent., medium 41 per cent., dry 7 per cent. Evaporation for 20 minutes, wet 

 air .50 c.c., medium air .69 c.c., dry air 1.42 c.c. 



Graph 10 shows the reaction of an Evarthiuc sodalis larva to an air flow of 19.0 

 liters per minute and a temperature of 22 C. Relative humidity of air, wet 58 

 per cent., medium 41 per cent., dry 7 per cent. Evaporation for 20 minutes, wet 

 air .60 c.c., medium air i.oo c.c., dry air 1.60 r.c. 



Graph n shows the reaction of an Evarthrus sodalis larva to an air flow of 22.4 

 liters per minute and a temperature of 21.5 C. Relative humidity of air, wet 60 

 per cent., medium 42 per cent., dry 6 per cent. Evaporation for 20 minutes, wet 

 air .54 c.c., medium air 1.07 c.c., dry ail 1.75 c.c. 



Graph 12 shows the reaction of an Evarthrus sodalis larva to a low percentage of 

 carbon dioxide. Tempeiature 18 C. Relative humidity of air, 75 per cent. Rate 

 of air flow 13.3 liters per minute. Per rent, of carbon dioxide in the different thirds 

 of the cage, 4.0 (at left), 2.2, and o.o. 



Graph 13 shows the reaction of an Ewttthrus sodalis larva to an increase in the 

 per cent. 01 carbon dioxide. Temperature 18 C. Relative hurridity of the air, 

 75 per cent. Rate of air flow 13.3 liters per minute. Per cent, of carbon dioxide in 

 the different thirds of the cage, 7.2 (at left), 4.0, and o.o. 



Graph 14 shows the reaction of an unknown species of larva to a still higher 

 percentage of carbon dioxide. Temperature 19 C. Relative humidity of the 

 air, 95 per cent. Rate of air flow 13.3 liters per minute. Per cent, of carbon dioxide 

 in the different thirds of the cage, 9.0 (at left), 2.8, and o.o. 



