34 VICTOR E. SHELFORD 



Chart I 



Showing the modification of the behavior of the red backed salamander (Ple- 

 thodon) and toad (Bufo) through a gradient of evaporation due to rapid movement 

 of ordinary air in one section, the other two sections being supplied with respec- 

 tively moist and ordinary air at the standard rate of flow (12 liters per minute, a 

 velocity of .08 meters per second). The rapid flow was approximately .65 meters 

 per second, or about 8 times the standard. The temperature is given in degrees 

 centigrade. Immediately above the three columns of the ruled paper between 

 the time scales is given the evaporation from the Livingston evaporimeters in 

 hundredths of cc. during a period of 20 minutes immediately before and after the 

 experiment. Distance from right to left represents the movements of the animals 

 in the cage (lengthwise) and time is indicated by vertical distance as measured 

 by the scales. The broken line is used where two or three animals move together. 

 In the controls the large S's indicate that still air was used in the three sections. 



