I wish to call your attention to a few observations which I have made in regard to a want of calcification and decalcification of the enamel and dentine. The conclusions arrived at are the result of the study of three cases which have presented themselves to me for treatment.
The first case is that of Miss C., 24 years of age. Her jaws have gradually come closer together, owing to a wearing away of the teeth. The front teeth have exceeded the back ones so that considerable space was noticed between her front teeth. The articulation was so poor that she was unable to chew her food and mastication was imperfectly performed with the vault of her mouth and tongue. Owing to the constant use of her tongue for purpose of mastication, hypertrophy had taken place to such an extent that her speech had become impaired. She was a constant