106 
PROCEEDINGS OF THE NATURAE [April, 1887. 
of disturbance among the returning wasps. They did not enter 
the nest but circled about just over it, seeming greatly excited. 
After sometime one, more intelligent or venturesome than the 
others flew in, and sooner or later, all followed. In the course 
of three hours all became accustomed to the paper and worked 
as usual. 
On August 9 at 2:40 p. m., we substituted a blue paper for the 
red. The wasps seemed as much confused as in the preceding 
experiment, becoming reconciled to the blue, however, in a little 
more than two hours. 
On August 10, at 9 a. m., wishing to try an experiment on the 
sense of direction, we removed the blue paper, caught a cage full 
of wasps and took them away, leaving the ground around the 
nest exposed. On our return, one hour afterward, we found 
twenty-five or thirty wasps buzzing about, apparently not know¬ 
ing how to get into the nest. We replaced the blue paper when 
all immediately went in. 
On August 10 at 4:50 p. m., we substituted a yellow paper for 
the blue and during the next ten minutes one of us counted 130 
wasps which noticed the change, while the other oounted eight 
which seemed not to notice it. The 130 circled around the nest 
once or twice, or in some cases four or five times, before entering. 
We now went away for a time but returned at 5:30 p. m. for an¬ 
other observation. During the following ten minutes one hun¬ 
dred wasps entered the nest, seventy of which flew about awhile 
before going in, while the other thirty did not notice the yellow 
paper having, very probably, passed through it before. On Au¬ 
gust 11 at 9:30 a. m., the yellow paper having been over the nest 
for about three working hours, of 200 wasps only eight hesitated 
before entering. At 10 a. m. we placed three dark red nastur- 
tium blossoms on the y P llow paper two inches from the hole. 
fined * ° f th<3 146 Which entered forty-six no- 
iced the flowers by flying to them and almost alighting, and of 
these quite as many were flying well to one side of the flowers 
~t ng t 7 ° Ver the “- In the next five -mutes 
10.05-10.10, twenty-nine out of 126 noticed the nasturtiums. 
