52 



JOHN B. WATSON 



food box d, 5 cm. in diameter and 8 cm. high. This was sup- 

 plied with a lid e perforated with several 1 mm. holes to allow 

 the possibility of olfactory stimulation. A small vertical rod 

 was screwed into the center of the lid. The rod passed up through 

 a hole in the wire mesh of the problem box and restraining cage 

 (the sleeve / was needed to keep the animals from attempting 

 to push through the hole in the mesh). By means of this rod the 

 experimenter could allow the animal to get food at the desired 



FIG. 1 



time. The food cup had a raised bottom below which was cut an 

 inside screw thread. A disc supplied with the same sized threads 

 was screwed into the wooden floor of the problem box. The 

 metal food box could thus be fastened securely into this floor 

 plate. This device afforded a firm support for the food box 

 and also made its removal for cleaning quite easy. The firm 

 support was found to be necessary because when the animals were 

 not fed immediately they attacked this box with the utmost 

 vigor. 



