"During the first few months of an infant's life, its manner of taking the breast, of laying its head on the pillow, etc., becomes crystallized into im...

Everyone knows that at the age of 11-12, children have a marked impulse to form themselves into groups and that the respect paid to the rules and regulations of their play constitutes an important feature of this social life.
Everyone knows that at the age of 11-12, children have a marked impulse to form themselves into grou...
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