654 R. M. STRONG 
Unfortunately, the writer did not find it practicable to eliminate 
the possibility of stimulation of the nerves of general sensation 
in the experiments. The operations which would be involved 
in cutting all of the nerves of general sensation which might pos- 
sibly be concerned were, in the writer’s judgment, too severe to 
be worth attempting. Not only the innervation of the nasal 
cavities, but also that of the mouth chamber, would be involved. 
It has been suggested by Professor Herrick that a series of tests 
be made with birds whose olfactory nerves had been cut, but it 
has not yet been possible to attempt this desirable experiment. 
However, the extreme tenuity of the odorous material where 
stimulation occurred would appear to require a sensitivity far 
more acute than that which is known to be possessed by general 
sensory endings. A quantity of only about 5 cc. of oil of berga- 
mot, for instance, was used and there was no significant loss in 
volume during the months which were occupied by the series of 
experiments. 
In the author’s judgment, the results of the ring dove experi- 
ments warrant the conclusion that the behavior of some birds at 
least may be affected by olfactory stimulation. 
