Printed in the U.S.A. Date on the title page. Third Printing, stated. Authorized Translation from the German by Wooster Woodruff Beman. Prefaces, Definitions, Theorems, Proofs, Footnotes; [v], 115 pages plus 2 blank leaves. The original red cloth has several spots on the upper board, an indentation on the fore-edges, and touches of rubbing to the extremities; gilt lettering on the upper board is clear, though faded on the spine. The interior leaves have remained creamy-bright and are completely clean. Ink signature on the front pastedown of Professor Charles H. Toll, Amherst 1926. [Please see my five images of the actual book.] From the preface to the first essay: ""As professor in the Polytechnic School in Zurich I found myself for the first time obliged to lecture upon the elements of the differential calculus and felt more keenly than ever before the lack of a really scientific foundation for arithmetic."" As with every book from my father's collection, tipped-in at the front is the small, attractive, acid-free bookplate pictured on my homepage. All books are wrapped with special care and are shipped promptly with tracking; international sales sent via global priority, also with tracking.