(g) He introduced into his perpetual motion machine, Fig. 4, the idea of a magnetic motor, a clever idea^ indeed, for a thirteenth century engineer.

This rapid summary will serve to show that the letter of Peregrinus is one of great interest in physics as well as in navigation and geodesy. For nearly three centuries, it lay unnoticed among the libraries of Europe, but it did not escape Gilbert, who makes frequent mention of it in his De Magnete, 1 600 ; nor the illustrious Jesuit writers, Caba3us, who refers to it in hiá Philosophic1 Magnética, 1629, and Kircher, who quotes from it in his De Arte Magnética, 1641 ; it was well known to Jean Taisnier, the Belgian plagiarist, wrho transferred a great part of it verbatim to the pages of h is De Natura Magnetis, 1562, without a word of acknowledgment. By this piece of fraud, Taisnier acquired considerable celebrity, a fact that goes to show the meritorious character of the work which he unscrupulously copied.

This memorable letter is divided into two

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