Treatise on dental caries : experimental and therapeutic investigations . One of these teeth,which had a very deep furrow in the centre of its crown, hasat this point an extremely large excavation, in which seem tobe deposited the debris of albuminous shreds which have there,in position, undergone themost advanced putrefaction(Fig. 16, B). This excava-tion, soft at the bottom, un-even and fragile at the bor-ders, presents eveiy charac-teristic of true caries. The protected teeth haveundergone upon the exposedpoints a similar effect; one of them, exposed Upon the most in a%0vering of wax.^
Treatise on dental caries : experimental and therapeutic investigations . One of these teeth,which had a very deep furrow in the centre of its crown, hasat this point an extremely large excavation, in which seem tobe deposited the debris of albuminous shreds which have there,in position, undergone themost advanced putrefaction(Fig. 16, B). This excava-tion, soft at the bottom, un-even and fragile at the bor-ders, presents eveiy charac-teristic of true caries. The protected teeth haveundergone upon the exposedpoints a similar effect; one of them, exposed Upon the most in a%0vering of wax.^ of the resistant part of its enamel, terior face of the crown of an adult incisor- B. Caries of the masticating surface of a has experienced but a slight molar. alteration resembling the beginning of caries (Fig. 16, A).Another tooth, exposed upon the free edge deprived of enamel,has there experienced a softening still more pronounced, whichhas resulted in the formation of a cavity in the form of a deepcleft, with every characteristic of caries properly so Fro. 10. Two Cases of Artificial Caries de-veloped in Albumen upon points left exposed Conclusions. — Albumen and all albuminoid substances•whatsoever, whose action we may consider as uniform, 10 146 ETIOLOGY AND EXPERIMENTS. can of themselves effect no alteration of the it is only by the results of their fermentationthat these effects can be produced. Now, left to them-selves, these substances enter upon putrefaction and theformation of the heavy acids of the acetic and benzoicseries. The elements drawn from this latter series neednot occupy us, for they are evidently without any pos-sible alterative action. In the acetic series, on the otherhand, are found butyric acid, whose manifest influencewe have studied by itself, and valeric acid, identicalin its action with the foregoing, and some other analo-gous derivatives. These acids have clearly been producedin our experiment, the reaction of t
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