Series of Bodies deviveafiom the fuming liquor o/" Cadet. 437 



fluid is separated, and again distilled with hydriodic acid. In 

 order to free it from water, it is allowed to stand some days in 

 a closed tube in contact with lime and chloride of calcium, and 

 then distilled in a tube filled with carbonic acid until the half 

 or, at the most, two thirds has passed over. The iodide thus 

 produced is a thin yellowish liquid, smells somewhat similar 

 to the chloride, has a high specific gravity; remains fluid at 

 — 10° C. 



Boiling point considerably above 100'^ C. The vapour of 

 it is yellowish. If allowed to stand in the air, forms beautiful 

 prismatic crystals. The iodide is soluble in aether and alcohol ; 

 insoluble in water; decomposed by sulphuric and nitric acid. 

 When heated in the air it burns yielding vapour of iodine. 

 Formula O H'= As- 1-. The specific gravity of the vapour 

 could not be determined, because it is easily decomposed by 

 mercury. The calculated is 5-816. 



Protobromide. — Formed by distillingconcentrated hydrobro- 

 mic acid with h3'drargochloride of cacodyloxide ; it forms a 

 fuming yellow liquid, very similar in its properties to Kd CI. 

 Protojtaoride is obtained in a manner analogous to the pre- 

 ceding ; it is a colourless fluid of insupportable smell, inso- 

 luble in water, but suffers decomposition by it. It attacks 

 glass; C^H-' As-Fl-. 



Hydrargo-Moride of Cacodyloxide'^'. — When a dilute alco- 

 holic solution of oxide of cacodyl is added to a dilute solution 

 of corrosive sublimate, a voluminous white body is precipi- 

 tated, which consists of the above compound mixed with ca- 

 lomel ; from this it may be freed by repeated crystallizations. 

 It may be formed with any other compound of cacodyl which 

 is similarly constituted to the oxide. An excess of sublimate 

 decomposes the salt. Formula C< H' ■ As O + Hg- Cl«. 

 Bunsen leaves it for tiie present undetermined whether the 

 oxygen is only 1, 1^ or 2 atoms. He assumes that sublimate 

 is contained in it, because potassa precipitates oxide of mer- 

 cury, and hydriodic acid produces the scarlet iodide and iodide 

 of cacodyl, &c. &c. By distillation with phosphorous acid it 

 is decomposed into chloride of cacodyl and calomel. Chloride 

 of gold is reduced by it. 



100 parts of boiling water dissolve 3'4<7 parts of the salt; 

 at 18^ C. the solution contains only 0*2 1 parts. It is soluble 

 in alcohol, inodorous if not brought into the nose; taste 

 disagreeably metallic; in larger (juantities is poisonous, &c. 



• We may here remark, tluit this name is a literal translation from the 

 German Quecksilberchloritl Kakodyloxycl. Wc do so because an anonymous 

 writer has criticised our notices, on account of'the nomenclature, in a short 

 paper in the Phil. Mag. 



