which possesses the characteristic Properties of Tannin. 131 
Coal. 
100 grains of Ccpal - - - - 67 grains, 
— Mastich - - - 66 
— Balsam of Peru - 64 
— Elemi 63 
Tacamahac 62 
— Guaiacum - 58 
— Gum ammoniac 58 
— - — — - Amber - 56 
Olive oil 55 
— — Balsam of Tolu 54 
* — Asa foetida - 5 1 
Wax - 50 
— — — Dragon’s blood - 48 
- — Benzoin 48 
— — — — Olibanum - 44 
- — Myrrh - 40 
— Asphaltum - 40 
— - Gamboge - - - 31 
Elastic bitumen - - 31 
■ — Gum arabic 29 
- — Liquorice - 25 
• — — Manna - 25 
— — Tragacanth - - 22 
— — — — * Caoutchouc - - - 12* 
The coal obtained from the resinous bodies by means of 
sulphuric acid, is in a much greater proportion, than when 
* Caoutchouc and elastic bitumen were only superficially carbonized by the sul- 
phuric acid, so that the proportion of coal as above stated, is considerably less than 
that, which in reality might have been obtained from them. 
S 2 
