496 Journal of Comparative Neurology and Psychology. 



movements.^ The animal's feet were so troublesome that it 

 was found to be best to secure them in an easy position by- 

 means of tape fastened to hooks behind. Great care was taken 

 in placing the animal in the nest, and in adjusting the breast 

 plate from day to day. If the tape were drawn too tightly, the 

 breathing became abnormal ; whereas, if drawn too loosely, the 

 vertical position of the bird varied during the experiment and 



Fig. I. Pneumograph. Z, fixed board; M., position of animal ; A^, tambour? 

 adjustment of breast-plate by means of screws, O and P ; S, lower edge of box 

 covering bird. 



altered the tension of the breast-plate, thus producing modifica- 

 tions in the tracing which were not due to the stimuli. No 

 records were used which appeared untrustworthy. To avoid 

 fright, the room was usually darkened before the bird was han- 

 dled." In no case was it kept in position longer than was abso- 

 lutely necessary. 



'Bert P. Legons sur la physiologic comparee de la respiration, 323-4. 

 Paris, 1870. 



^Klein, L. W. Methods in Animal V&ycho\ogy,American Journal of Psychol- 

 ogy, 10, 256-279, 1897. 



Mills, W. Nature of Animal Intelligence and Methods of Investigating it, 

 Psychological Revie'w, 6, 262-274, 1897. 



