RESPONSES TO LIGHT OF THE ROACH. 



377 



TABLE IV. 



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

 TO AVOID ENTERING A SPECIFIC DARK PLACE. 



Roach No. 39. These experiments extended over eight days. Slow to learn. 



its antennae and other appendages. Occasionally it would simply 

 stand there and wave its antennae. Whenever the roach did not, 

 of its own accord, approach the dark chamber and whenever it 

 paused for some time before the entrance to it, I stroked its back 

 or even gently shoved it towards the darkness. The stroking 

 and shoving was done with a piece of wire the end of which had 



