AGE 29 Tooth Years Central Incisor Lateral Incisor Canine First Bicuspid Second Bicuspid First Molar Second Molar 7.10 7.8S 10.87 10.50 11.57 6.48 11.79 General Characteristics of Teeth.—In some rare cases the temporary teeth may either appear abnormally early or be present at birth, a condition probably due to hereditary syphilis. P. S. Khosla13 reports the case of a Hindu male child in whom he found the lower central incisor coming out of gums, when he saw him the next day after his birth. S. N. Chatterjiu also reports the case of a male child who was born with two well-marked incisor teeth in the lower jaw. On the other hand, eruption of the temporary" teeth may be delayed for a considerable time owing to rickets and other nutritional diseases. The temporary teeth commence to be shed about the sixth or seventh year after the eruption of the permanent first molar teeth. Hence in a child of six or seven years there will be twenty-four teeth, viz. twenty temporary teeth and four permanent first molar teeth. The permanent teeth erupt at first in the lower jaw and after short intervals in the upper jaw, but are not always regular in their appearance. In a few cases they may appear earlier than the average period. rPhe time of eruption of the third molar teeth or wisdom teeth is more uncertain. After the eruption of the second molar teeth the body of the jaw grows pos- teriorly and the ramus is elongated to make room- for the appearance of the third molar teeth. Hence, during the examination of a minor for determin- ing his age, a note should always be made as to whether there was a space in the jaw behind the second molar teeth, if the third molars were absent. These teeth are usually cut between 17 and 25 years of age, but I have seen the left lower third molar tooth in a Mohamedan boy and a Mohamedan girl, aged 14 years respectively, and in a Hindu boy of 15 years. I have also found the lower third molar teeth in a Hindu boy of 16 years. Sahay found three third molar teeth in a Bawari boy, aged between 15 and 16 years. Lall and Townsend15 found one third molar tooth between the ages of 15 and 16 years, two third molar teeth between the ages of 16 and 17 years and three third molar teeth between 17 and 18 years of age in a majority of 125 girls examined in Lucknow. On the other hand, in some rare cases the third molar teeth may not appear till adult age is advanced. I have seen a man of 40 and another of 48 who had not cut their third molar teeth. K. Venkat Rao16 reports the case of a man, who, at the age of 54 years, cut his third molar tooth in the right upper jaw, while it was still absent in the left upper jaw. Both the third molar teeth were present in the lower jaw. The notched and stunted upper central incisors of inherited syphilis^ known ^ as Hutchinson's teeth, are always permanent. In old age the teeth have either fallen off or the crowns are worn away to the sockets. So times a smooth rounded surface is to be seen in place of alveolar cavities. 13. Indian Med. Gaz., Feb. 1927, p. 68. 14 Indian Medical Gazette, January 1932, p. 57. 15. Ind. Med. Gaz^ Get 1939, p. 614. 16. Indian Medical Gazette, March 1932, p. 127.