SENSORY ADAPTATIONS OF BATS. I 83 



onds ; (3) 2^/^ minutes. (4) Quiet 12 minutes, was disturbed 

 and then went to the cloth in 2 minutes. (5) Quiet 5 minutes, 

 disturbed, then responded in i minute. (6) Quiet 1 1 minutes ; 

 disturbed, then went to cloth in 3 minutes. (7) 45 seconds. (8) 

 8 seconds. (9) 75 seconds. (10) 45 seconds. 



February 21: (i) 75 seconds; (2) 45 seconds; (3) \]^ 

 minutes. (4) Became quiet for 8^ minutes; disturbed, then 

 went to cloth in i minute; (5) seven seconds; (6) 12 seconds. 

 (7) Quiet for 5 minutes. Disturbed, then went slowly to cloth 

 in I minute, (8) Quiet ; disturbed, then became quiet again and 

 was disturbed a second time. Went by indirect route to the 

 cloth 2^^ minutes after second disturbance. (9) Ran to front of 

 cage and climbed to cloth in 20 seconds. Dropped the worm 

 given it and then turned around and took hold of the cloth with 

 its teeth. (10) Became quiet ; was disturbed after 7 minutes and 

 flew directly to cloth 25 seconds later. 



February 22 : (i) Put in at i: 57. Flew directly to cloth and 

 pulled at it with teeth in 10 seconds. (2) Flew directly to cloth 

 in I 5 seconds. These two trials show that, as on several pre- 

 ceding days, there was no error in finding the cloth. There has 

 been delay due to inhibition of the stimulus or the lethargy of 

 the animal but it has been finding the piece of cloth quickly 

 whenever it was trying to find it. 



At this point the bat was taken out of the cage and placed 

 temporarily in a box. The cage was rotated through 180 de- 

 grees so that the front now faced the west instead of the east. 

 The observer's chair was also moved to the west side and a box 

 in which there was another bat moving about was moved from 

 the east side where it had been kept during the greater part of 

 the experiments, to the west side. It is to be remembered that 

 the door of the cage is in the middle upper part of the front and 

 the cloth is at the upper, left or back edge of the door, 7 inches 

 from the left end of the cage and 20 inches from the right end. 



After the cage was reversed and the observer again seated in 

 front, the bat was placed in it. 



Trial (i). — Was placed on the floor facing the cloth ; looked 

 about, slowly turning its head, then turned the body and flew 

 directly to back of cage at a point about 7 inches from the right end 



