380 Analysis of Opium. [Nov. 



colourless, and effloresces in the air. When strongly heated 

 it is decomposed, and sulphate of barytes remains. 



The salt of lime is deliquescent. That of potash cry- 

 stallizes in pearly plates. 



13. Ammonia Sulphate of Carhydrogen, or sulpho-methy- 

 lene of Dumas is formed by passing a current of dry am- 

 monia over sulphate of carbydrogen. A soft crystalline 

 mass is formed. It may be also procured by th« action of 

 liquid ammonia upon sulphate of carbydrogen. The liquid 

 which remains after the re-action, when evaporated in 

 vacuo, furnishes beautiful crystals, whose composition is 

 exactly represented by an atom of anhydrous sulphate of 

 carbydrogen, united to an atom of anhydrous sulphate of 

 ammonia. 



14. Ammonia with Oxalate of Carbydrogen, or Oxamethy- 

 lane of Dumas, is produced when a current of dry ammo- 

 niacal gas is passed over oxalate of carbydrogen. A white 

 crystalline mass is formed, when dissolved in alcohol ; cubic 

 crystals are obtained by evaporation. In order to under- 

 stand its composition, we have only to admit that pyroxylic 

 spirit is produced during the action, 2 atoms oxalate of 

 carbydrogen, and 1 ammonia being converted into an atom 

 of oxamethylane, and 1 of pyroxylic spirit. 



15. Urethylane is the name given to the product of the 

 action of chloro-carbonate of carbydrogen with ammonia ; 

 much sal-ammoniac is formed, and a deliquescent sub- 

 stance crystallizing in needles. 



In remarking upon these compounds, Dumas observes, 

 that di-hydrate of carbydrogen is isomeric with alcohol ; 

 Bicarbonate of carbydrogen with citric or malic acid; 

 Oxalate of carbydrogen with succinic acid ; Formate of 

 carbydrogen with acetic acid ; Acetate of carbydrogen with 

 formic ether ; Citrate of carbydrogen with anhydrous 

 sugar. 



Article VIIL 

 Analysis of Opium.* 



CouERBE gives the following method for analyzing this 

 complicated substance, as proposed by Gregory : 



• Ana. de Chimie, lix. 151. 



