Charles Darwin 
Expression of the Emotions in Man and Animals 

pub One.info present you this new edition. 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.