. The Dental cosmos. eeof inaccuracy will depend on the homolo-gous points selected to determine theposition of the side lines. Fig. 13 showsthis; the more distal to the rotation arethe homologous points chosen, the lesswould be the inaccuracy. With instrument, a correct readingwould be obtained in this case, providedthe homologous points chosen are distalto the rotation. The conclusion which I draw fromthis work with the modified instrumentsis that, in the majority of cases of muti-lation of the teeth anterior to the first molar, the first molar does not drift asmuch forward as
. The Dental cosmos. eeof inaccuracy will depend on the homolo-gous points selected to determine theposition of the side lines. Fig. 13 showsthis; the more distal to the rotation arethe homologous points chosen, the lesswould be the inaccuracy. With instrument, a correct readingwould be obtained in this case, providedthe homologous points chosen are distalto the rotation. The conclusion which I draw fromthis work with the modified instrumentsis that, in the majority of cases of muti-lation of the teeth anterior to the first molar, the first molar does not drift asmuch forward as Dr. Griinbergs sym-metroscope indicates. (See Figs. 14-26.) THE CORRECT INTERPRETATION OF CLASSIFICATION. I now turn to the other matter whichI wish to discuss. There is nothing con-nected with the science of orthodontiawhich is more abused, or rather misused,than Dr. Angles classification to whichI have referred above. There are two possible interpretationsof this classification. The first—I be- Fig. lieve Dr. Angles—which is used andunderstood by a few, is its interpretationas a classification of the jaws, indicatedby the relation of the first molars whenthe latter are in correct relationship totheir respective jaws. There are manypassages in Dr. Angles book which sup-port this view ; also in a discussion ofDr. Greys paper entitled Malocclusionof the Teeth: Diagnosis, published inthe American Orthodontist, vol. i, Xo. 2,Dr. Angle says—There are two ways oflooking at the matter. First, to makethe diagnosis from the present appear-ance of the teeth or from the symptomsonly; and second, from the basis of nor-mal occlusion—the only true way tomake a diagnosis of on, he says—So I would say,judge not from appearance, the positionsof the teeth that have migrated, but VINEY.—VACCINE IN THE TREATMENT OF PYORRHEA ALVEOLARIS. 833 from the normal position of the upperfirst molar. And where any mutilationhas occurred, and is followed, as it in
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