In regard to application in dentistry, he stated:—“Each errant fang is distinctly placed, however deeply imbedded within its alveolar socket; teeth before their eruption stand forth in plain view; an unsuspected exostosis is revealed; a pocket of necrosis, of suppuration, or of tuberculosis is revealed in its exact outlines; the extent and area and location of metallic fillings are sharply delineated, whether above or below the alveolar line. Most interesting is the fact that the pulp-chamber is beautifully outlined, and that erosions and enlargements may be readily detected.” 206. The author saw one of Dr. Morton’s original photographed sciagraphs of the thorax, 15 inches by 11 inches, not at all creditably reproduced at page 161. In the original, to the surgeon’s eye: “The acromion and coracoid processes of the shoulder blade are clearly shown in their relations to the head of the humerus, or arm bone, and also the end of the clavicle, or collar bone, is shown in its relations to the shoulder joint. We have, in short, an inner inspection in a living person of this rather complicated joint, the shoulder, and there can be no doubt that in defined pictures of this nature even very slight deformities and diseases would be detected. It is noticeable that the front portions of the ribs are not shown, only the posterior portions lying nearest to the sensitized plate appear; also the breastbone was sufficiently dense to almost entirely obstruct the X-rays. A collar button at the back of the neck is taken through the backbone. In some of my negatives the dark outline of the heart and liver is shown as well as the outlines of tumors in the brain; but this is evidently for purposes of demonstrating the location of organs, an over-exposure, and does not, therefore, indicate the outlines of the heart.” The time of exposure was reduced by the use of a fluorescent screen in conjunction with the photographic plate. 207. A woman was troubled with a stiffened wrist. Dr. Morton took a single sciagraph of both wrists side by side as shown at page 174, (the photographic print being presented for this book by E. B. Meyrowitz, 104 East 23d Street, N.Y.) The injured wrist in the picture exhibited the Colles’ Fracture—the ulna and radius bones being telescoped into their fractured ends by a fall upon the sidewalk a year before. By knowing the cause, the manner of cure became evident, and, accordingly, the patient is expected to bend the wrist backward and forward and laterally several times a day. [Illustration: From sciagraph of club foot of child by Prof. Goodspeed. Copyright, ’96, by William Beverley Harison, Pub. of X-ray pictures, New York. This linograph (woodcut), engraved and donated by Stephen J. Cox, Downing Building, 108 Fulton St., New York, affords an exact likeness of the sciagraph,—well-nigh impossible by an untouched half-tone. ]