Diseases of Gasolene Automobiles and How To Cure Them. A. L. Dyke and G. P. Dorris, 210 pp. Price $1.50. A. L. Dyke, St. Louis, Mo.

The rapid increase in the use of gasolene engines as the motor for automobiles, launches, and stationary purposes has, as might have been expected, been the occasion for numerous books and other publications devoted to the same. The one above mentioned contains a great deal of information which would certainly be of great value to engine operators and owners. A novel yet valuable feature of this book is the large number of clippings from the various publications and answers to same which have been included as a part of the matter presented. Numerous illustrations supplement the text. Had the typographical work been better the book would have presented a more satisfactory appearance, but in view of the information conveyed this will be overlooked by most readers. It is certainly well worth the money to any owner of an automobile fitted with a gasoline engine.

The A. B. C. of Photo-Micrography. W. H. Wams-ley, F. R. M. S., F. A. A. A. S. 155 pp. Price $1.25. Tennant and Ward, New York.

This book is intended for those who are totally unacquainted with this most interesting branch of scien tific work, and gives with much detail the instructions necessary to surmount the obstacles which beset a beginner, a feature not covered by other works upon this subject. To those who are not familiar with the subject matter of this book, yet who deligut in photographic and microscopic work, the reading of its pages will be extremely profitable. Thirteen plates illustrating photo-micrographical subjects add much to its value. It is well and plainly written and is certainly a valuable addition to the literature of this subject.