In a short chapter on 'The X-ray in dentistry’ in his 1896 textbook^ he has this to say of the new dental diagnostic tool. 'The density of teeth is greater than that of bone, and for that reason, pictures of the living teeth may be taken by the X-ray even of wandering fang or root, however deeply imbedded in its socket. Also children’s teeth may be photographed before they have escaped from the gums, and the extent and area and location of metallic fillings may be sharply delineated, even though concealed from outer view. The lost end of a broken drill may be found, and, what is more interesting, the fact that even the central cavity of the tooth may be outlined, so that diseases within the tooth may be detected.’