only one that can read a man's feelings from his eyes and his
facial expression.

The Marvelous Beaver. Let us consider this animal as an
illuminating example of high-power intelligence.

In domestic economy the beaver is the most intelligent of all
living mammals. His inherited knowledge, his original thought, his
reasoning power and his engineering and mechanical skill in
constructive works are marvelous and beyond compare. In his
manifold industrial activities, there is no other mammal that is
even a good second to him. He builds dams both great and
small, to provide water in which to live, to store food and to
escape from his enemies. He builds air-tight houses of sticks and
mud, either as islands, or on the shore. When he cannot live as a
pond-beaver with a house he cheerfully becomes a river-beaver.
He lives in a river-bank burrow when house-building in a pond
is impossible; and he will cheerfully tunnel under a stone wall
from one-pond monotony, to go exploring outside.

[Illustration: CHRISTMAS AT THE
PRIMATES' HOUSE Chimpanzees (with large ears) and orang-utans
(small ears). The animal on the extreme right is an orang of the
common caste]

He cuts down trees, both small and large, and he makes them fall
as he wishes them to fall. He trims off all branches, and leaves
no "slash" to cumber the ground. He buries green branches, in
great quantity, in the mud at the bottom of his pond, so that in
winter he can get at them under a foot of solid ice. He digs