The Expression of the Emotions in Man and Animals

Excerpt

CHAP.  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 ............27-49