4«32 Dr. Kane on the Protochloride and Terchloride of Iodine. 



the clear liquor and distilling, the terchloride can be gotten 

 nearly pure. A great number of analyses were made of it, 

 which, though the specimens prepared in different ways and 

 at different times gave results slightly varying, all agreed within 

 narrow limits with the formula 3 Cl + I, which gives 



Chlorine... 35-4<2 x 3 = 106*26 45*66 



Iodine 126*30 = 126*30 54*34 



232*56 100*00 



" The properties of this compound, admitting its existence, 

 are, generally speaking, similar to those of the protochloride, 

 with one exception, which serves to distinguish it from it, and 

 to determine when it is rendered impure by admixture with 

 any of it. When the terchloride of iodine is mixed with 

 protochloride of tin, iodine is thrown down ; but when more 

 chloride of tin is added, in place of forming the orange-red 

 crystals of protiodide of tin with the excess of protochloride 

 of tin, the iodine dissolves and forms a perfectly colourless 

 solution ; therefore, in distilling the chloride of iodine, as long 

 as the distilled liquor forms any orange-red crystals with an 

 excess of protochloride of tin, it has not been as yet freed suf- 

 ficiently from protochloride of iodine." 



Soubeiran doubts altogether the existence of the perchlo- 

 ride (€15+ 1), in consequence of his not having been able to 

 obtain it pure. I have not myself made any experiments on 

 that subject, but from the positive results of Davy and Gay- 

 Lussac, I am still disposed to admit of its existence and to 

 consider that there are three chlorides of iodine, CI I, CI3 I, 

 and CI5 I. 



I cannot conclude this note without expressing the great 

 pleasure I received from seeing my early results confirmed by 

 the accurate experiments of Soubeiran, and in stating that 

 although obliged by justice to myself to call the attention of 

 chemists to my former paper, yet that the recent memoir in 

 the Journal de Pharmacie has filled up an important vacancy 

 in science, by showing that the terchloride was of a more per- 

 manent nature and could be obtained by simpler processes 

 than I had been inclined to suppose; and I am sure had 

 Soubeiran attempted to analyse the compound with maximum 

 of iodine, he would have much illustrated the history of that 

 body, which I was able at the time but partially to explore. 



Dublin, April 12, 1837. 



