COMPOUND ETHERS. 777 



ofZeise; KO,EO+C 2 S 4 . This salt contains 2 atoms of bisul- 

 phuret of carbon, united with 1 of potash and 1 of oxide of 

 ethyl. It is formed on pouring the bisulphuret of carbon into 

 absolute alcohol saturated cold with hydrate of potash, and 

 keeping the mixture at a gentle heat; the liquor becomes a 

 crystalline mass of the salt at 32. The salt crystallizes in 

 colourless or yellowish crystals. 



Sulphocarbonate of oxide of ethyl and water or xanthic acid, 

 HO,EO + C 2 S 4 , is obtained as an oily liquid, insoluble in water, 

 when the preceding potash salt is decomposed by dilute sul- 

 phuric or hydrochloric acid. 



Bicyannurate of oxide of ethyl, cyanic ether, 3EO + 2Cy 3 O 3 

 -f6HO. This compound was obtained by Liebig and Woehler 

 by directing the vapours of hydrated cyanic acid into a mixture 

 of alcohol and ether, as long as they were absorbed. The com- 

 pound crystallizes after twenty-four hours 5 repose, and is puri- 

 fied from cyamelide, with which it is accompanied, by solution 

 in boiling alcohol or water and a second crystallization. Its 

 solution is neutral to test paper, and it does not form compounds 

 with metallic oxides. 



Benzoate of oxide ethyl, benzole ether, C 4 H 5 O + C 14 H 5 O 3 = 

 EO,BzO. This is a liquid ether, of density 1.0539 at 50 (10 

 cent.), boiling at 408.2 (210 cent.), prepared by distilling a 

 mixture of 4 parts of alcohol of 83 per cent. (0.840) with 2 

 parts of crystallized benzoic acid, and 1 part of concentrated hy- 

 drochloric acid. 



Hippurate of oxide of ethyl, hippuric e^er,C 4 H 5 O+C 18 H 8 N 

 O 5 . This compound was first prepared by Dr. Stenhouse. It 

 is obtained in fine crystalline needles, perfectly white, and of a 

 silky lustre. The crystals are not volatile, their density is 

 1.043 at 73.4 (23 cent.) ; they fuse at 109.4 (43 cent.) 



Chloroxi-carbonic ether, C 4 H 5 O + C 2 O 3 C1. This name has 

 been given by M. Dumas to an ethereal liquid, which is formed 

 when absolute alcohol is brought into contact with chloro- 

 carbonic acid gas (page 378). Its density is 1.33 at 59 ; it boils 

 at 201 .2 (94cent.). 



Urethane, C 6 H 7 O 4 N. This substance is formed, with sal am- 

 moniac, on dissolving the preceding compound in solution of 

 ammonia. Purified by distillation, it is a pearly-white, crys- 

 talline substance, resembling spermaceti; it fuses at 212, and 



