"The only known writing of Gilbert in English is in the form of a letter dated 14th February (?1602) which appears at the end of William Barlowe's "Magneticall Advertisements or divers observations concerning the loadstone," quarto London 1616, and reads as follows: To the Worshipfull my good friend, Mr. William Barlowe at Easton by Winchester. "...you have shewed mee more—and brought more light than any man hath done. ...Johannes Franciscus Sagredus... a great Magneticall man... writeth that hee hath conferred with divers learned men of Venice and with the Readers of Padua and reporteth wonderfull liking of my booke, you shall have a coppy of the letter: Sir, I propose to adjoyne an appendix of six or eight sheets of paper to my booke after a while, I am in hand with it of some new inventions, and I would have some of your experiments, in your name and invention put into it, if you please, that you may be knowen for an augmenter of that art. So for this time in haste I take my leave the xiiyth of February. Your very loving friend, W. GILBERT." His intention to print the short appendix was never carried into effect."