but it soon corrodes and becomes useless. Va-rious cements have been tried, but a perfect one hasnot yet been obtained. Substitute foe Ivory.—The British Journal of Den-tal Science states that dry collodion, when mixed withgutta percha, or india rubber, forms a compound ofgreat hardness and… … ISSUED FROM THE UNITED STATES PATENT OFFICE FOR THE WEEK ENDING MAY G, 1862. Reported Official!!/ for the Scientific American *#* Pamphlets giving full particulars of the mode of applying forpatents, under the new law which went into force March 2, 1861, speci-fying size of model required, and much…
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