Every theory of love, from Plato down teaches that each individual loves in the other sex what he lacks in himself.

Man is largely a creature of habit, and many of his activities are more or less automatic reflexes from the stimuli of his environment.

Muscles are in a most intimate and peculiar sense the organs of the will.

The teens are emotionally unstable and pathic. It is a natural impulse to experience hot and perfervid psychic states, and it is characterized by emotionalism. We see here the instability and fluctuations now so characteristic. The emotions develop by contrast and reaction into the opposite.

Precisely what menstruation is, is not yet very well known.

Of all work-schools, a good farm is probably the best for motor development.

Adolescence is when the very worst and best impulses in the human soul struggle against each other for possession.