m
which it was taking the grains of starch. The creature must have
remembered the route to and from the spore-cell. The same must be said
of the water-louse observed by myself, which not only came back to the
source of its food-supply, but also returned to a certain lurking-spot
at which it hid itself each time until it had eaten the hydra buds. It
must be remembered that a journey of one inch, to these minute little
creatures, is, comparatively speaking, an immense distance. Each grain
of sand, each particle of decayed vegetable matter, etc., is, to these
microscopic animalcules, a gigantic boulder, a mighty muck heap. These
obstacles in the path undoubtedly serve as landmarks to the wandering
myriads of microscopic animalcules.

It can be demonstrated that the snail has memory of locality. This
creature is essentially a homing animal, as I will show in the chapter
on Auxiliary Senses, consequently we would naturally expect to find it
possessing memory of locality. An interesting observation by Mr.
Lonsdale, an English observer, which has been often quoted, clearly
proves that this creature does possess this psychical function. Mr.
Lonsdale placed two snails in a small and badly kept garden. One of them
was weak and poorly nourished, the other strong and well. The strong one
disappeared and was traced by its slimy track over a wall into a
neighboring garden where there was plenty of food. Mr. Lonsdale thought
that it had deserted its mate, but it subsequently appeared and
conducted its comrade over the wall into the bountiful food-supply of
the neighboring garden. It seemed to coax and assist its feeble
companion when it lingered on the way.[35]

[35] Darwin, _Descent of Man_, pp. 262, 263.

Marked bees and ants invariably return to places where they have found
food-supplies, thus showing the possession of a memory of locality and
route. It is very interesting to watch a marked ant during her journey
back to her nest, after she has been carried away and placed among
unfamiliar scenes and surroundings. At first, owing to her fright, she
will dash away helter-skelter; but soon recovering, she will head in the
direction of home, and moderate her pace until she creeps along at a
very cautious and circumspect gait, indeed. Every now and then she will
climb a tall grass-blade or weed and take observations. After a while
she sees certain landmarks, and her speed becomes faster; soon the
surrounding country becomes famili