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 that it must be so. We should be tempted to call out “Eureka” like the sage of old. But Harvey’s first thought was simply how to completely test and thoroughly prove this idea. He did not at once accept his own conception of motion in a circle, but tested it by experiment; for, says he, “I afterwards found it to be true and finally saw” that the blood was distributed in such a, way. In fact, he put his own hypothesis into the assay, and proved its truth so clearly and by such able arguments, that even at the present day any one wanting to prove the circulation of the blood (microscopic observations and fine injections not being used) must adopt Harvey’s method In fine, he brought his doctrine to demonstration, and proved it once for all; and, throughout everything was done by observation and induction. There is no theorizing, no useless attempts at explanation, no employment of imagination, no guesses at truth ; all is fact arranged in order and leading slowly but certainly up to certain truth. Then the