374 



C. H. TURNER. 



high. One end was transformed into a dark chamber 19.5 centi- 

 meters long. Between the dark chamber and the lighted portion 

 an opaque curtain dropped to within 2 centimeters of the floor. 



TABLE I. 



SHOWING THE ABILITY OF ADULT FEMALE ROACHES TO LEARN TO AVOID ENTERING 



A SPECIFIC DARK PLACE. 



Roach No. i. An old female that was the subject of these experiments for 

 over thirty-six days. During that time she laid four oothecae. During the last 



To help interpret the behavior observed in the other two 

 boxes, box number three was constructed. Like the others it was 

 of glass. It was 25 centimeters long, 8 centimeters wide and 8 

 centimeters high. A dark chamber 15 centimeters long and of 

 the same width and height as the glass box was placed in one end. 

 In the middle of the partition which separated this dark chamber 

 from the lighted portion of the glass box there was a door 3 centi- 

 meters wide and 2 centimeters high. 



