Mr. Cooper has taken much care in cutting the blocks.
Some of the photographs and drawings, namely, those by Mr. May,
and those by Mr. Wolf of the Cynopithecus, were first reproduced
by Mr. Cooper on wood by means of photography, and then engraved:
by this means almost complete fidelity is ensured.
CHAPTER I.
GENERAL PRINCIPLES OF EXPRESSION.
The three chief principles stated--The first principle--Serviceable actions
become habitual in association with certain states of the mind,
and are performed whether or not of service in each particular case--
The force of habit--Inheritance--Associated habitual movements in man--
Reflex actions--Passage of habits into reflex actions--Associated habitual
movements in the lower animals--Concluding remarks.
I WILL begin by giving the three Principles, which appear to me
to account for most of the expressions and gestures involuntarily used
by man and the lower animals, under the influence of various emotions
and sensations.[1] I arrived, however, at these three Principles
only at the close of my observations. They will be discussed
in the present and two following chapters in a general manner.
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