640 R. M. STRONG 
Management of birds. Before the taking of records was begun, 
the doves were trained to look for food without the use of any 
odor. They were induced to enter a chamber by a trail of seed 
which led to the food box. In the course of a week, they lost their 
fear of entering the chambers, and it was found practicable to 
work with them twice a day. 
The doves were kept in cages which stood in the room contain- 
ing the apparatus. Their view of the apparatus was cut off by 
a screen, though this precaution was probably unnecessary. 
Even when the bird had been placed inside the main enclosure, 
on several occasions, before the seed box had been put in place, 
it gave no evidence of having profited by the opportunity it had 
had to see the location of the food, but went through the usual 
search for the proper chamber to enter. Thus, on one occasion, 
a dove after such an opportunity went to all three of the empty 
chambers before it entered the one containing the food. 
Each bird was allowed enough time to eat all the food it wished. 
It then almost invariably returned to the main enclosure, and was 
driven out through the entrance d, fig. A, into a cage which had 
been placed alongside. After a few weeks, the removal was easily 
accomplished, for the doves became accustomed to passing out 
when a stick was waved over the apparatus. 
Records. The significant movements of the birds were recorded 
usually by means of symbols. The sign = was used to indicate 
that the dove entered a chamber so far that it should have been 
able to see whether food was present or not. The simple approach 
of a bird to or within a few inches of the opening of a chamber 
without an entrance which would be complete enough to enable 
it to see whether food was present or not, was designated by the 
sign —. Thus the form 30— B = C = A indicated that dove 
No. 30 in the writer’s breeding register went to the opening of 
chamber B but did not enter. It then turned and entered cham- 
bers C and A, the latter containing the food. Notes were made 
of interesting or unusual variations in the behavior of the birds. 
