London: H. Murray, 1795. Half Leather. First Edition. First English Edition. lxiii, vi, 515, viii, xxviii, 520 pp. 8vo. 6 plates in Volume I, 14 plates in Volume II. Brown leather spines with gold incised bands, dark brown leather patch title with gold embossed titling. Marbled paper boards with faux-vellume corners. Clean within, light foxing to both text and plates. Volume I missing half-title page, Volume II half-title page is present. Page 173 is numbered "137"; page 356 is numbered "310"; page 357 is numbered "307. Page 451 has a small margin tear, there are some chips to the head and foot of the first pages of Volume I, does not impact text. Leaf 474/475 is not in the book, misnumbered 476/477; no text is missing, there is no break in content, simply a misnumbering. Some plates bound out of order or not in chronological order, all are present. Volume 2, Plate IV is mis-labeled "VI." Very Good.
At the invitation of King Frederick the Great of Prussia, Leonhard Euler (1707–1783) tutored the Princess of Anhalt-Dessau, the king's niece. Over the next several years, Euler wrote more than 200 letters to her on a broad range of subjects relating to physics and mathematics, as well as offering insights into Euler's personality and religious beliefs.