and Terchloride of Iodine, 4S1 



then bleached litmus paper: when cooled considerably it de?- 

 posited a considerable quantity of a reddish yellow matter, 

 which was again redissolved by heat." 



For analysis an excess of pure potash was added, the 

 whole dried and ignited, redissolved and precipitated by ni- 

 trate of silver, the mixed chloride and iodide of silver sepa- 

 rated by ammonia. In two analyses were obtained, 

 1. 2. 



Chlorine ... 22-36 23-76 ^^^^ / 23-06 



Mean j^^.^ 



Iodine 77-64 76-24 176-94 



100-00 100-00 100-00 



The body Cl + I should give 



Chlorine 35-42 , 21*9 



lodme 126-30 78-1 



161-72 100-0 



" The solution of this chloride in water is deep reddish 

 yellow. On the skin it produces a deep yellow mark, and 

 smarting is not soon washed off. When heated it is partially 

 decomposed, and by frequent distillations can be completely 

 decomposed into iodine and the terchloride. 



" When put in contact with the red oxide of mercury, the 

 red or brown oxide of lead, or the oxides of copper, there is 

 oxygen copiously disengaged, while chloride and iodide of the 

 respective metals are produced, and some iodine deposited. 

 With oxide of zinc this reaction is particularly remarkable. 

 The action of this chloride of iodine on metallic chlorides 

 gives rise to some interesting phaenomena, which are exhibited 

 in a tabular form in the original paper, to which I shall refer 

 for the details. With protochloride of tin, the protochloride 

 of iodine gives perchloride of tin and protiodide of tin in 

 splendid orange prisms; iodine being separated by the first 

 action but subsequently dissolved. Thus, 



3(C1 + St) + (C1 + I) = 2(Cl2 + St) + (I + St); 



and with other protochlorides the metal is carried to the 

 highest degree of combination with the chlorine." 



" Of the Terchloride of Iodine, — When a solution of the 

 protochloride of iodine has been repeatedly distilled, the quan- 

 tity of iodine which separates each time diminishes, until at 

 last a liquor is obtained which is vaporized unaltered. It then 

 contains terchloride, although it is exceedingly difficult to 

 obtain it pure. It can likewise be obtained by adding to 

 protochloride of iodine a strong solution of corrosive subli- 

 mate, which throws down much iodine ; and on pouring off 



