OLFACTORY REACTIONS IN AMPHIBIANS 



633 



The tests were carried out in periods of approximately five- 

 minute durations, followed by intervals of rest varying in length 

 of time. It sometimes happened that the animals were too rest- 

 less to allow a fair interpretation of their reactions; in such cases 

 the tests were discontinued. Other individuals again, were 

 amenable to the trials for several hours without showing them- 

 selves to be disturbed. Precaution was taken that no odors 

 entered the chamber otherwise than by means of the appropriate 

 tube. 



Records of the trials indicated what reaction followed the 

 stimulus applied to the nostrils. The records shown in table 1 

 will serve as samples. 



TABLE 1 

 Toad No. 1 



Toad No. 2 



