Il6 A. O. WEESE. 



each case. The longest stay in the dry end was in the eighteenth minute about 

 forty seconds. 



Experiment 3. This experiment is typical of those performed with Phrynosoma 

 douglasii, and shows very little. The animal was inclined to be sluggish and 

 finally, at the end of the period, burrowed in the middle section of the cage, where 

 the humidity was 25 per cent, and the evaporation .8 c.c. 



Experiments 40, 4b. This animal, beginning in the center section of the cage, 

 moved, after nearly one minute, to the dry end, where attempts to escape, indicated 

 by the dotted line, were recorded. It turned back from the medium section twice 

 in the next two minutes, attempting to escape during the second stay in the dry 

 section, and then spent nearly two minutes in the wet end, turning back twice from 

 the medium air. A short visit to the dry end was then recorded, and then, at the 

 beginning of the ninth minute, a marked escape reaction in the dry end, followed by 

 a period of three and one half minutes, when the animal burrowed beneath the soil. 

 While under the soil, the anima! gradual'y moved toward the center of the cage and 

 finally emerged there. Theieafter visits to the dry third were of very short dura- 

 tion until near the end of the period when escape at this end is again attempted. 

 During the second period (46) the animal was very active, and, except that, in 

 general, the apices of the curves in the section of the diagram representing the dry 

 end of the cage are more acute, indicating quicker turning here, very little can be 

 said. There were many escape reactions in all parts of the cage. 



Experiment sa, sb. Control 50. This expeiiment shows more definitely than any 

 other the relation between stimulation to escape attempts and the length of stay 

 in the dry air. It will be noted that escape attempts were recorded throughout each 

 stay of any length in the diy air, and that, aside from these periods of stimulation 

 the animal spent the gi eater part of the time in the center section of the cage. One 

 short burrowing movement was recorded at the end of the fourth minute of the 

 first period. The control, as elsewhere, showed a rather active movement from end 

 to end of the cage, but no avoidance of any region. 



