The Dental cosmos . develop-ment of the bones of thenose, and hypertrophy ofthe bones and mucous mem-brane, are concomitants. Agood illustration of hyper-trophy of mucous membranefrom want of use is observedby dentists when gums puffup, thicken, and extendone-half to three-fourths ofthe length of the teeth fromlack of brushing. It wouldbe absurd for anyone to saythat mouth-breathing is thecause of one case of V-shaped arch in every twenty,and that some other causeproduced the rest of the de-formities. We must have alaw which will work in all va-rieties of contracted archesas well as the V-shap
The Dental cosmos . develop-ment of the bones of thenose, and hypertrophy ofthe bones and mucous mem-brane, are concomitants. Agood illustration of hyper-trophy of mucous membranefrom want of use is observedby dentists when gums puffup, thicken, and extendone-half to three-fourths ofthe length of the teeth fromlack of brushing. It wouldbe absurd for anyone to saythat mouth-breathing is thecause of one case of V-shaped arch in every twenty,and that some other causeproduced the rest of the de-formities. We must have alaw which will work in all va-rieties of contracted archesas well as the V-shaped,which variety constitutes avery small percentage of thewhole. I have watched thedevelopment of these dif-ferent varieties for the pastfourteen years, have takenimpressions of the mouthsof some of the most marked cases every three months, and have com-pared them. I have also produced most of these different typicalforms of irregularities during the movement of the teeth for the pur-pose of correcting MOUTH-BREATHING, ETC. 929 Having, then, discovered that the arrest of the development of themaxillary bones is the cause of contracted jaws and irregularities ofthe teeth, have we not a good foundation to work upon to discover thecause of deflected septum and of mouth-breathing? The following tables will exhibit the differences in the heights ofvaults, both in normal and defective jaws. The height is taken cen-trally and vertically from the gingival plane on a transverse line inter-secting the gingival crests between the second bicuspids and firstmolars. For comparison with measurements of denuded crania, de-duct .07 for the thickness of the soft tissues. Fig. 7 shows the instru-ment used, and the manner of making the measurements. Normal Jaw. Height No. ofof Vault. Cases. Height No. ofof Vault. Cases. Height No. ofof Vault. Cases. Height No. ofof Vault. Cases. .21 70 .31 m•34 169•37 146 •40 159•43 199•53 429 ?56 936•59 514.
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