TO GO OUT OF THEIR WAY. 271 
pins; while in returning to the nest they persistently 
came down the side of the pillar nearest to the nest, 
though I repeatedly attempted to guide them the 
other way. Even when placed on the paper bridge 
between mM and M, they were very dissatisfied. In 
fact, it was obvious that they knew they were being 
sent a long way round, and were attempting to make a 
shorter cut. 
I then again placed the larve on the column at 
M, and when the ants were once more going to and 
f-o regularly along the paper path, I altered the 
position of the column and larve to mM’, placing the 
edge of the pillar, which the ants had been accustomed 
to ascend, towards the paper bridge, connecting it with 
the original bridge by a side- Fig. 30. 
bridge a, M being an inch from 
the original bridge. Under 
these circumstances three ants 
ran on to M; then two found 
their way over the bridge a to 
mM’. Of the next ten ants, five 
went to M and five over a to mM’. 
The next ten all went over the paper bridge a to M’. 
I then put the pillar and the larvee on the other side 
of the original paper path at m’’, connected with the 
main path by a short bridge a’, taking for a’ a new 
piece of paper, so that. scent would be no guide. I left 
the little bridge a in its place. The ants went as 
follows :-— 
