174 CLYDE C. HAMILTON. 



CHART III. 



Graph 15 shows the control for two species of adult Carabids. The first one 

 half is the control for an Evarthrus sodalis adult and the second one half for a 

 Patrobus longicornis aduit. Temperature 21 C. No air flow. 



Graph 16 shows the reaction of a Pterostichus stygicus adult to dry air and a 

 temperature of 20.5 C. Relative humidity of air, wet 95 per cent., medium 86 

 per cent., dry 13 per cent. Rate of air flow 13.3 liters per minute. 



Graph 17 shows the reaction ot a Pterostichus corvinus adult to dry air at a tem- 

 perature of 19.5 C. Relative humidity of air, wet 83 per cent., medium 59 per 

 cent., dry 6 per cent. Rate of air flow 13.3 liters per minute. 



Graph 18 shows the reaction of a Pterostichus corvinus adult to dry air and a 

 temperature of 16.5 C.,with an increase in the rate of air flow to 19.0 liters per 

 minute. Relative humidity of air, wet 80 per cent., medium 50 per cent., dry 6 

 per cent. 



Graph 19 shows the reaction of an Evarthrus sodalis adult to gradients of am- 

 monia. Temperature 22 C. Relative humidity of air, 98 per cent. Rate of air 

 flow 13.3 liters per minute. 



Graph 20 shows the reaction of a Pterostichus stygicus adult to gradients of 

 carbon dioxide. Temperature 22 C. Relative humidity of the air, 90 per cent. 

 Rate of air flow 13.3 liters per minute. Percentage of carbon dioxide in the different 

 thirds of the cage, 7.2, 3.6, and o.o. 



Graph 21 shows the reaction of an Evarthrus sodalis adult to an increase in the 

 percentage of carbon dioxide. Temperature 22.5 C. Relative humidity of the 

 air, 86 per cent. Rate of air flow 13.3 liters per minute. Peicentage of carbon 

 dioxide in the different thirds of the cage, 14.0, 7.0, and o.o. 



