This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1878 edition. Excerpt: ...it is acknowledged that the contact of the saliva impregnated with sugary substances produces upon some teeth, deprived of their enamel by wear or commencing caries, the sensation called " sotting on edge," and even real pain, just in the same way as do acids. All these facts find here their explanation. The experiments, whose results we have just set forth, were instituted by us several years ago and have already been put on record.1 Latterly, an experimenter, M. Mantegazza, professor of general pathology at the University of Pavia,2 desiring to elucidate this question of the action of sugar upon the teeth, has undertaken a series of observations which have led him to nearly the same conclusions as ours. Nevertheless his processes were different. Human teeth dried and weighed wei-e introduced into solutions of sugar of varying degrees of concentration, one portion in distilled water, another in saliva taken directly from the mouth. The liquids at first neutral or alkaline, had at the end of some days an acid reaction; the liquid contained traces of lime, and the teeth had lost in weight. Therefore it was certain that the sugar had attacked the teeth. It remained then to determine experimentally if this change had taken place from the sugar directly or by the transformations it undergoes when exposed to the air. This was omitted in the observations of M. Mantegazza. Our own personal experiments have, it seems to us, refuted in advance every objection or doubt which this kind of question may raise. (6.) Lactic Acid. Exp. I.--A solution of one part in one thousand, or 1 gram of lactic acid to 1 liter of water, originally having an extremely feeble acid reaction, have not at the end of two years perceptibly changed, if we except a...
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