. The Dental cosmos. Lower aspect of Fig. 3. animation of a specimen of this orderwill show that the first premolars deflectbackward from the point where theyemerge from the process to their cuttingedges, to the extent of one millimeteror more. This alone would account forthe deflection of the line which the essay-ist has drawn. I have grave doubts whether in Fig. 5[Fig. 14] the conditions shown wouldprove the assertions made—viz: Thisphotograph shows clearly the far-reachinginfluence of the use of the teeth in thedevelopment of the bones of the skull, for the most remote bones from the teethh
. The Dental cosmos. Lower aspect of Fig. 3. animation of a specimen of this orderwill show that the first premolars deflectbackward from the point where theyemerge from the process to their cuttingedges, to the extent of one millimeteror more. This alone would account forthe deflection of the line which the essay-ist has drawn. I have grave doubts whether in Fig. 5[Fig. 14] the conditions shown wouldprove the assertions made—viz: Thisphotograph shows clearly the far-reachinginfluence of the use of the teeth in thedevelopment of the bones of the skull, for the most remote bones from the teethhave been perceptibly varied by interfer-ing with their function. With but one specimen to prove thisstatement, and with a variation notgreater than one might find in a normalspecimen collected in its native habitat,it seems to me that the essayist has madean assertion which an examination ofthe facts will not bear out. Fjg. 5. [ 14.]. Posterior aspect of the skull of an operated-on rabbit. It is not possible to attach much im-portance to his table of the relativeweights of the skulls shown. In the firstplace, the sex should have been , it should ha ve been noted that onespecimen, No. 5, was killed two weeksearlier than the animal from which thecontrol skull was taken, and that theformer is 5 mm. shorter over all than thelatter. All else being equal, specimen No. 12(Fig. 3) and the control might easilyhave varied five grains in weight, owing tothe fact that one had been carried To a 171 THE DEXTAL COSMOS. greater point of desiccation than theother. A small difference in the amountof membrane removed from the nasalfossa?, which clings to the turbinatedbones and is extremely difficult to dissectout, would also account for this difference. That these experiments may becomeof permanent value, I would suggest— (1) That the experimenter enter intoan exhaustive study of the crania in ourmuseums, to establ
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectdentist, bookyear1912
