The Dental cosmos . n a similar manner to that on theright, but its position is normal. The temporary cuspid on the leftside remains. Owing to the fact that there was insufficient room 93^ THE DENTAL COSMOS. in the jaw for the second molar, the teeth anterior to these moved for-ward, producing the V-shaped projection of the central incisors. Case 12.—Fig. 19. Charles D., age fifteen years; nationality,American. Height of vault, .53 of an inch. Deflection of septum nasiand thickening of mucous membrane. The patient has always breathedthrough the mouth. This case is similar to case No. 8, in tha
The Dental cosmos . n a similar manner to that on theright, but its position is normal. The temporary cuspid on the leftside remains. Owing to the fact that there was insufficient room 93^ THE DENTAL COSMOS. in the jaw for the second molar, the teeth anterior to these moved for-ward, producing the V-shaped projection of the central incisors. Case 12.—Fig. 19. Charles D., age fifteen years; nationality,American. Height of vault, .53 of an inch. Deflection of septum nasiand thickening of mucous membrane. The patient has always breathedthrough the mouth. This case is similar to case No. 8, in that the small jaw is inheritedfrom the mother and the large teeth from the father. The dental arch is contracted anterior to the cuspids, and theanterior teeth are crowded; posterior to the cuspids the dentalarch is normal. The first bicuspid on the left side has been removedto afford more room for the other teeth ; the corresponding tooth onthe right side should also have been removed. The fact that it was Fig. allowed to remain caused a crowded condition on that side, and theincisor has passed beyond the median line of the jaw, encroachingupon the other side. Owing to there being insufficient room in thejaw for the second molars, the teeth anterior to these have pushedforward, producing the V-shaped protrusion of the central incisors. Case is-—Fig. 20. Mr. H. B., age twenty years ; nationality, . Height of vault, .71 of an inch. Has always breathed through themouth. The alveolar process is well developed, but the maxillarybones are arrested in their development. The left nostril is entirelyclosed. There is hypertrophy of the mucous membrane of the rightnostril. Has had scarlet fever and whooping-cough. Although there isarrested development of the maxillary bones in this case, no deformityis produced, owing to the fact that the teeth have crowded the alveolarprocess upon the outer surface of the bone, thus forming a large arch. MOUTH-BREATHING, ETC. 939 The only irregul
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