The most vital educational problem will always be how to make the best use of the child's earlier years, not only for the reason that in them many receive their entire school training, but also because, while the power of the child to learn increases with age, his susceptibility to formative influences diminishes, and so rapid is the working of this law that President Eliot thinks that "the temperament, physical constitution, mental aptitudes, and moral quality of a boy are all well determined by the time he is 18 years old."…
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