Introduction to the history of science: Vol. II (in two parts): From Rabbi Ben Ezra to Roger Bacon. By George Sarton, Associate in the History of Science, Carnegie Institution of Washington. xii-1251 pages 18 x 26.6 cms. Baltimore, the Williams & Wilkins Co. Price $12.00

Introduction to the history of science,

Introduction to the history of science, volume 1, from Homer to Omar Khayyam: By George Sarton, Associate in the History of Science, Carnegie Institution of Washington, xi–839 pages, large 8vo. Baltimore, The Williams and Wilkins Company, Price, $10

✍ Henry Leffmann 📂 Article 📅 1927 🏛 Elsevier Science 🌐 English ⚖ 185 KB

## BOOK REVIEWS. 13I sphere with the angles of an imaginary equilateral tetrahedron. He demonstrated to the meeting how this model could be used for illustrating the structure of both fatty and aromatic compounds. As is now well known, the model has been simplified into the regular tetrahedron and