A JUNGLE LABOR-UNION 165 
animal trail, and this, a la calf-path, for the street 
of a future city. 
The part that scent plays in the trails is evi- 
denced if we scatter an inch or two of fresh sand 
across the road. A mass of ants banks against 
the strange obstruction on both sides, on the one 
hand a solid phalanx of waving green banners, 
and on the other a mob of empty-jawed workers 
with wildly waving antenne. Scouts from both 
sides slowly wander forward, and finally reach 
one another and pass across. But not for ten 
minutes does anything like regular traffic begin 
again. 
When carrying a large piece of leaf, and trav- 
eling at a fair rate of speed, the ants average 
about a foot in ten seconds, although many go 
the same distance in five. I tested the speed of 
an Atta, and then I saw that its leaf seemed 
to have a peculiar-shaped bug upon it, and picked 
it up with its bearer. Finding the blemish to be 
only a bit of fungus, I replaced it. Half an 
hour later I was seated by a trail far away, when 
suddenly my ant with the blemished spot ap- 
peared. It was unmistakable, for I had noticed 
that the spot was exactly that of the Egyptian 
symbol of life. I paced the trail, and found that 
