1814.] Analysis of Mineral and other Substances. 213 



Article VIII. 



Analysis of several Mineral, Vegetable, and Animal Substances. 



By Dr. John * 



The first section of this work contains the analysis of the juice 

 of the euphorbia cyparissias. It is composed of 



Water 77 



Tartaric acid Trace 



Resin 13'8 



Gum 2-75 



Extractive 275 



Albumen 1*37 



Caoutchouc 2^5 



Oil Trace 



100-42 



The earthy parts of the euphorbia are composed of the carbonate r 

 sulphate, and pliospliate of lime. 

 The analysis of the asclepias syriaca furnished 



Resin 26-50 



An elastic substance 12*50 



Vegetable gluten 400 



Tartaric acid and albumen 53-00 



96 



The plant when incinerated furnished carbonate of potash, phos- 

 phate of lime, phosphate of magnesia, silica, iron, and oxide of 

 manganese. 



The author next analysed an elastic scarlet coloured substance 

 which comes from the east through Turkey, and which is known by 

 the name of caoutchouc of Thibet. This brilliant and globular 

 matter serves for bracelets, ear-drops, rosaries, &c. to the Russian 

 ladies : and the substance which was usually considered as caout- 

 chouc is only an indurated and oxidated red oil. Its colouring 

 matter is analogous to that of stick lac.f 



The fruit of the rus typhinum contains gallic acid at the first 

 moment of its developemeut ; but as it advances to maturity bitar- 

 trate of lime is formed ; and as soon as the circulation of the sap in 



• Tlii« ihort paper is translated from the Ann. de Cliim. vol. Ixxxviii. p. 99, 

 inio Which it has been translated (rem the Cazeile LUeraire <le Jena fur March, 

 1M I. The paper givei BU account of a book published by Dr. John. 



) Bocaaig nu published ananalyib of it in the nut volume of Scbw cipher's 



Joiirn.il. He f.iund il a concrete Im-d oil of a red Colour | but COOld not lUCCetd 

 in titractiug fioui il a peculiar colouring matter, a-. announced by Johu, 



• > 



