An Analysis of the magnetical pyrites" with Remarks on some of the other Sulphurets of Iron. Read May 17, 1804.

(London, W. Bulmer and Co., 1804). 4to. No wrappers as extracted from ""Philosophical Transactions"" 1804 - Part II. Pp. 313-345. Clean and fine.

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First appearance of an importent paper in which Hatchett communicates his discovery that iron must be combined with a large portion of either carbon, phosphorus or sulphur in order to acquire the property of receiving permanent magnetic virtue, there being, however, a limit beyond which an excess of either of the above-named substances renders the compound wholly incapable of exhibiting the magnetic energy.Together with another paper by Patrick Russell: ""Remarks on the voluntary Expansion of the Skin of the Neck, in the Cobra de Capello or booded Snake of the East Indiea. With a Description of the Structure ofthe Parts which perform that Office. By Everard Home."" Pp. 346-352 a. 2 large engraved plates showing the snake.