Some Books Recently Received

Although the subject matter of this book is rather remote, it should prove of value to aeronautical engineers who are interested in the development of metals. The authors open with a description of the periodic table, giving some views on modern atomic theory, and then pass on to the subject of chemical equilibrium and the various methods employed in analysis. Thereafter they give a complete description of the means employed for the separation of the elements in ferrous and non‐ferrous alloys.