This book deals with the history of roentgenology, including the nature of the roentgen ray and its discovery by Roentgen. The Crookes tube, induction coil, and other apparatus used in producing roentgenograms are described and illustrated. The technic of exposures to secure the best results, with valuable hints on interpretation of dental and oral plates and films, is given. This part of the book is profusely illustrated. The book evidently is intended mainly for the dentist who aspires to become his own roentgenologist, and with this thought in mind the author directs his teaching to the beginner, rather than to the experienced roentgenologist. With this view of the book, it may be recommended without hesitation.