278 



APPENDIX. 



till the age of 17 or 25 years. The annexed cut (Farrar) repre- 

 sents (above the dotted line) an upper deciduous set of teeth. 



1, 1, central incisors, erupt between the 5th and 6th months; 



2, 2, lateral incisors, 7th and 10th months ; 3, 3, canines (eye 



' teeth), 12th and 

 16th months ; 4, 4, 

 5,5, all molars, 14th 

 and 36th months. 

 Total, 20. The low- 

 er teeth usually 

 precede the upper 

 -- . by a few weeks. 

 | e 6, 6 do not belong 

 to the deciduous 

 set, but, as they 

 erupt between the 

 fifth and sixth 

 years, are usually classed with them, and frequently decay 

 beyond remedy before the mistake is discovered. 



Dr. J. N. Farrar (New York), to whose works I am indebted 

 for information, says (Missouri Dental Journal, April, 1880) : 

 " The statistics in this country show that out of about 80 peo- 

 ple of all classes only one has sound teeth. This is the result 

 of a combination of causes systemic disturbances from climate, 

 food, crossing of races and types, and neglect. Most of the 

 cavities are caused by anatomical imperfections or overcrowd- 

 ing, nearly all of which develop before the thirty-fifth year. 

 * * * The science of dentistry, however, has checked much 

 of this suffering, and at this time (1879) there are 12,000 dentists 

 annually packing into tooth-cavities about half a ton of gold 

 $500,000. The estimated gold coinage value in this country is 

 about $150,000,000 ; this sum, at the rate gold is used for fill- 

 ings, would be transferred to graveyards in 300 years. The 

 value of the cheap fillings is about $100,000, and there are 

 annually manufactured about 3,000,000 artificial (porcelain) 

 teeth. * * * If $100 is put on interest (7 per cent.) at the 

 birth of a child, it ought to pay all dental expenses till the age 

 of 30 years ; but if the child's teeth are neglected, increased 

 dental bills result, with poor teeth at best, 



