370 EXPERIMENTS ON CO-OPERATION. 
At 8.45 she returned and took a larva, 
bE d 8.50 > ” 
+) 8.55 ” 9 
tb) 9. 2 ” 29 
” 9.11 2? ”° 
» 9.19 $5 55 
bb) 9.25 ”? 2 
» 9.33 #3 5 
» 9.40 3 3 
” 9.46 ” ” 
x» 9.52 » ” 
29 10.32 39 ” 
» 10.39 % » 
» 10.49 ” 
bb) 10.54 29 ” 
» 11.1 » » 
At this time I went to bed. There were still about 
twenty-five larve in the cup, which had all been 
removed when I looked at 6.15 the next morning 
During the whole time she was under observation, only 
two other ants found their way to the cup, though 
there were some wandering about in the box all day. 
Towards evening, however, they went into the nest, and 
for some hours my ant was the only one out. It will 
be observed that she returned at shorter intervals than 
the previous ones. This was partly because she had a 
shorter distance to go, and partly because she was not 
bewildered by three cups, like the preceding. I had 
placed a bit of wood to facilitate her ascent into the 
cup. This she made use of, but instead of going the 
shortest way to the cup, she followed the side of the 
box, partly, perhaps, because the floor was covered with 
a plate of porcelain. This, however, would not account 
for the fact that at first she invariably went beyond the 
cup, and even past the second cup; gradually, however, 
this circuit became smaller and smaller; but to the 
