REACTIONS OF ANIMALS. 



Microbembex Dry Air Pterostichus Dry Air 



Experiment 33 Control 33 Experiment 14 Control 14 



97 



CHART V. Compares the reactions of a diurnal dune animal (Microbembex) 

 and a nocturnal beech forest animal (Pterostichus). The two differ both in habitat 

 preference and daily habits and the graphs are strikingly different. The crosses in 

 tracings for Microbembex indicate that the animal was digging at the half minutes 

 indicated opposite. 



m 



areas but they rested in one position, the depth of the cages 

 not being sufficient to enable them to hop. The bronze tiger 

 beetle (Cicindela lecontei Hald.) was tried and gave a negative 

 reaction to air evaporating 1.2 c.c. in 20 minutes (3.6 c.c. per 

 hour) and a positive reaction to air evaporating 0.52 c.c. per 20 

 minutes (1.56 c.c. per hour) produced by heat and current. They 

 were so active that it was necessary to take readings of the number 

 in each third every ten seconds. 



2. Rapidly Flow Air. 



The rate of evaporation is markedly influenced by rate of 

 flow, and particularly there is a marked difference between a 

 barely measurable movement and a very slight breeze such as 

 .52 meter per second (i.i miles per hour). Table III. brings 



