Letter | Published:

History of Magnetism

Nature volume 14, page 10 | Download Citation



A PARAGRAPH in the article on “The Early History of Magnetism,” in your last number, contains a passage which requires, I think, a note of explanation. The writer says: “A Latin letter ascribed to Peter Adsiger, 1269, preserved among the manuscripts of the University of Leyden, contains the following remark on the declination of the needle…” Now Humboldt, on the authority of Libri, denies the existence of the passage in the Leyden MSS., affirming that it is only an interpolation in a Paris copy. But what is of more importance, he also states that the title of the letter is “Epistola Ptri P. de Maricourt ad Sigernum de Foucoucourt.” E. Walker, in his well-known essay on Magnetism, refers to Cavallo as quoting the supposed letter of Adsiger.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.


All prices are NET prices.

About this article

Publication history





  1. Search for S. J. PERRY in:


By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.