The most fascinating problems of history are veiled as closely from our curiosity as the statue of Egyptian Isis. Nothing is known for certain about the emergence from primitive barbarism of the great races, or about the determination of national characteristics. Analogies may be adduced from the material world; but the mysteries of organized vitality remain impenetrable. What made the Jew a Jew, the Greek a Greek, is as unexplained as what daily causes the germs of an oak and of an ash to produce different trees. All we know is that in the vague and infinitely distant past races were nourished into form and individuality by the varied operation of those unreckoned sympathies which attach man to nature, his primitive mother. But the laws of that rudimentary growth are still unknown; "the abysmal deeps of personality" in nations as in men remain unsounded: we cannot even experimentalize upon the process of ethnical development.

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