concerning the extraordinary light that has appeared in the Heavens for some years"), in Jean Leclerc's Bibliothèque Universelle et Historique, vol. III, Amsterdam, 1686 Réflexions sur une méthode de trouver les tangentes de certaines lignes courbes, qui vient d'être publiée dans un livre intitulé: Medicina Mentis ("Reflections on a method for finding the tangents of certain curves, recently published in a book titled Medicina Mentis"), Bibliothèque Universelle et Historique, vol. V, 1687 Excerpta ex suâ responsione ad excerpta ex litteris J. Bernouilli ("Excerpts from his response to excerpts from a letter by Johann Bernoulli"), Acta Eruditorum, Leipzig, 1700 "Epistola ad fratrem Joh. Christoph. Facium, qua vindicat Solutionem suam Problematis de inveniendo solido rotundo seu tereti in quo minima fiat resistentia" ("Letter to his brother Jean Christophe Fatio, vindicating his solution to the problem of the solid of revolution that produces the minimum resistance"), Philosophical Transactions, vol. XXVIII, pp. 172–6, 1713 "Four theorems, with their demonstration, for determining accurately the sun's parallax", Miscellanea curiosa mathematica, vol. II, no. 1 (London, 1745) Fatio also contributed articles on astronomy and ancient Hebrew units of measurement to nearly every number of the Gentleman's Magazine for 1737–38. Manuscripts Upon his death, Fatio left a number of manuscripts, some of which passed into the hands of Dr. James Johnstone of Kidderminster. Others were acquired by Prof. Georges-Louis Le Sage of Geneva, who amassed a large collection of Fatio's letters, now at the Bibliothèque de Genève. A few of Fatio's papers and letters are in the British Library. Among them is a Latin poem entitled N. Facii Duellerii Auriacus Throno-servatus ("N. Fatio de Duillier's Orange Throne Preserved", Addit. MS. 4163), containing a narrative of Count Fenil's plot against Prince William of Orange, as well as a description of Fatio's jewelled watches. A series of letters to Sir Hans Sloane (ib. 4044) extend from 1714 to 1736. Other letters of his are in fasciculus 2 of C. Hugenii aliorumque seculi xvii. virorum celebrium Exercitationes Mathematicæ et Philosophicæ, 4to, the Hague, 1833. Posthumous publications Some of Fatio's letters were included in the correspondence volumes of the Oeuvres complètes ("Complete Works") of Christiaan Huygens (published between 1888 and 1950 by the Dutch Academy of Sciences) and in The Correspondence of Isaac Newton (published between 1959 and 1977 by the Royal Society). Fatio's treatise describing his work on the push-shadow theory of gravity circulated during his lifetime only as a manuscript.