376 



C. H. TURNER. 



one or the lighted portion of box number two. If this was the 

 roach's first experience in the box it immediately rushed into the 

 dark chamber. The current was then turned on and kept on 

 until the roach returned to the lighted portion of the apparatus, 

 when it was immediately turned off. Sometimes the roach would 



TABLE III. 



SHOWING THE ABILITY OF ONE-HALF INCH LARVAL FEMALE ROACHES TO LEARN 

 TO AVOID ENTERING A SPECIFIC DARK PLACE. 



rush back again, or even several times, into the dark chamber; 

 but, usually, after receiving only one punishment, it would ap- 

 proach the dark chamber more cautiously than before, and if it 

 entered at all did so very slowly, as though expecting something 

 to happen. Sooner or later, on reaching the entrance to the 

 dark chamber, the roach would pause, feel about with its antennae, 

 then turn about and walk away or else remain there and clean 



