a considerable space. A wooden wedge will keep the teeth from springing together while the work is being done. The appliances designed by Drs. Perry, Bogue and others, for making rapid separations, I have not used, but hear favorable reports in regard to them. Having spoken of rapid and semi-rapid separations, it is left only to speak of a method which works very slowly. It applies, as a rule, to the biscuspids and molars only. In many cases where there are large cavities between these teeth, and often, when it is desirable that they should be filled with what I think is very properly called a "treatment filling," it is well to fill the entire space between the teeth with gutta-percha. In the course of a few months the process of mastication will force the gutta-percha toward the gum, and on removing what has not worn away the teeth will be found well separated, the cervical margins well in view, and the cavities in good condition for a metal filling.--_Archives of Dentistry._ ARTICLE VIII. COCAINE. WALTER W. ALLPORT, M. D., D. D. S., OF CHICAGO, ILL. The introduction of cocaine as a local anæsthetic, and the more general use of peroxide of hydrogen (H_{2}O_{2}) in the treatment of dental and oral diseases, are the principal advance made in the medical department of this practice during the year for which this report is made. The two forms of cocaine which have been most generally used in surgery are the hydrochlorate and the oleate.