414 



ANIMAL BODY: 



Pepys found : 



Cartilage 



Phosphate of lime 

 Carbonate of lime 

 Water and loss 



28-0 



58-0 



4-0 



10-0 



From analyses made by Lassaigne of human teeth at dif- 

 ferent ages, it appears that the phosphate of lime gradually 

 increases, and that there is a corresponding diminution of the 

 carbonate. 



Tooth of a child one day old 

 of a child aged 6 years 

 of an adult man 

 of a man aged 81 years . 



In the enamel of human teeth, Berzelius found : 

 Phosphate of lime with fluoride of calcium . 88 -5 

 Carbonate of lime . . .8-0 



Phosphate of magnesia . . .1-5 



Membrane, alkali, and water . .2-0 



So that this substance seems almost destitute of organic 

 combination. 



[Von Bibra has made the following analyses of human teeth 



Phosphate of lime with a T 

 little fluoride of calcium J 

 Carbonate of lime 

 Phosphate of magnesia 

 Salts 

 Cartilage 

 Fat 



Molar tooth of 

 an adult male. 



Enamel. 

 89-82 



4-37 

 1-34 



0-88 

 3-39 

 0-20 



Osseous portion. 



66-72 



3-36 

 1-08 

 0-83 

 27-61 

 0-40 



For a series of analyses of the teeth of the lower animals 

 I must refer the reader to the original work, (Chemische 

 Untersuchungen iiber die Knochen und Zahne des Menschen 

 und der Wirbelthiere,) which may be regarded as a perfect 

 monograph on the subject of which it treats.] 



