10 JUNE 1899, Page 25

The Steam Engine and Gas and Oil Engines. By John

Perry, D.Sc. (Macmillan and Co. 7e. 6d. net.)—This is a book by an expert which it must suffice to mention. " I aim throughout," says the author in his preface,' " at showing a student how he himself may attack problems which are, as yet, only partially solved."