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WITH animals which have their sexes separated, the males necessarily differ from the females in their organs of reproduction; and these are the primary sexual characters. But the sexes often diffe...
The principle of direct action of the excited nervous system on the body, independently of the will and in part of habit--Change of colour in the hair--Trembling of the muscles--Modified secretions--P...
The Principle of Antithesis--Instances in the dog and cat--Origin of the principle--Conventional signs--The principle of antithesis has not arisen from opposite actions being consciously performed und...
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 particul...

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