34 
ANIMAL INTELLIGENCE. 
r 
A 
a 
EX 
ITT 
s 
J m 
similar slides of glass, on one of which, A, there was placed 
pupae, while the other, m, was left empty. Sir John Lub- 
bock watched two particular (marked) ants 
proceeding from A to A and back again, 
carrying the pupae on h to the nest A. 
Whenever an ant came out of A upon B he 
transposed the slips / and g. Therefore at 
the angle below n there was a choice pre- 
sented to the ant of taking the unscented 
pathway leading to the full glass A, or the 
scented pathway leading to the empty glass 
m. The two marked ants, knowing their 
way, always took the right turn at the 
Flg * lo angle ; but the stranger ants, being guided 
only by scent, for the most part took the wrong turn at 
the angle, so going to the empty glass m. For out of 150 
stranger ants only 21 went to A, while the remaining 129 
went to m. Still the fact that all the stranger ants did 
not follow the erroneous scent-trail to m, may be taken to 
indicate that they are also assisted in finding treasure by 
the sense of sight, though in a lesser degree. Therefore 
Sir John Lubbock concludes that in finding treasure 6 they 
are guided in some cases by sight, while in others they 
track one another by scent.’ 
As further evidence showing how much more ants de- 
pend upon scent than upon sight in finding their way, the 
following experiment may be quoted. In the accompany- 
ing woodcut (Fig. 2) the line marked 1, 2, 3 represents 
the edge of a paper bridge leading to the nest ; A the 
top of a pencil which is standing perpendicularly upon 
a board, represented by the general black surface ; B 
the top of the same pencil when moved a distance of 
a few inches from its first position A. On the lop 
of this pencil were placed some pupae. Sir John Lub- 
bock, after contriving this arrangement, marked an ant 
and put it upon the pupae on the top of the pencil. 
After she had made two journeys carrying pupae from the 
pencil to the nest (the tracks she pursued being repre- 
sented by the two thick white lines), while she was in the 
nest he moved the pencil to its position at B. The thin 
