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the Heart; and that the Royal Society, with its motto, 'Nullius addictus jurare in verba magistri,' was a foundation of a much later date. And consequently, I think, we may feel justified in saying that, so far as the purely scientific factor of a man's nature can be said to have any distinctive or personal character at all, independence, or robustness, or manliness, whichever word we may like to choose, as shown in superiority to mere authority and the weight of great names, was a distinctive character of Harvey as a man of science. With Riolanus in full vigour, and Van der Linden growing towards maturity, as champions of antiquity, it required not a little manliness to assert, 'contra receptas vias per tot saecula annorum ab innumeris iisque clarissimis doctissimisque viris' (Riolanus was often thus spoken of), 'tritam atque illustratam' (De dicatio, p. 5), the claims of simple Nature 'quâ nihil antiquius majorisve auctoritatis' (Epistola Secunda ad Riolanum, p. 123). This element of real manliness shows itself again, I think, in Harvey's power of abstaining from suggesting a rationale of what