650 R. M. STRONG 
TABLE 13 
Bitd 2... hth eee Pe ee ers ere 62 50a P02 24 
Golomners ee cena! an a neem eee ees 25 sil 630: ate 
Mish oy eee S cicnate chia rie Mike = ts oie ot a ie ane aaa 
Violetsachet powders. . 255045) lee seo nae 4 5s he + 
Oilofbergamboyce bee votes Lee oe { @ 186h S16 | AG a Saleh 
6. CONTROL EXPERIMENTS WITH WHITE RATS 
A pair of rats were used as a test of the efficiency of the appara- 
tus. They gave the following results when oil of bergamot was 
employed, the conditions being those which were furnished the 
ring doves. 
| TOTAL NUMBER 
PERCENTAGE MEAN Torn 
OF TRIALS 
IN EDIE es pert eect n 8 tae Pope oe A ei | 0.62 0.406-+ 59 
Remalerat 4) 0 See are ee eee Cenk. 0.71 0.316+ 60 
It is the writer’s opinion that the rats found their food usually, 
if not always, when not by accident, through an association of the 
odor of oil of bergamot with the location of the food. In a short 
series of trials which were made without any odor, the rats 
appeared to find the food (sunflower seed) by the method of trial. 
That these keen scented animals made so many mistakes is prob- 
ably explained by their tendency to enter the first chamber they 
came to and sometimes the next in order before they made any 
attempt to localize the source of the odor of oil of bergamot which 
was all of the time entering the enclosure. 
7. RESULTS OF OTHER EXPERIMENTS AND OBSERVATIONS 
The writer spent about ten weeks of the winter of 1906 in Flor- 
ida, where some observations were made on the habits of the 
turkey vulture. Some very simple experiments with meat 
wrapped in paper resulted negatively, but the conditions of the 
experiments did not warrant the conclusion that meat is not 
smelled by these birds. During a tramp through a pine forest, 
