1901 - 2 .] Dissociation of Compound of Iodine and Thio-urea. 239 
connected with the salts is considerable, owing to the instability of 
the hydroxide or of the corresponding amine base. 
In discussing the properties of the di-iodide in solution, I have 
referred only to the double balancing action 
2C8N 2 H 4 + 1 2 ^ (CSN 2 H 4 ) 2 I 2 === (CS N 2 H 4 ) 2 ‘ ‘ + 21' , 
but this will not represent the complete condition of equilibrium ; 
some of the liberated iodine will form periodide, and, from indica- 
tions I have observed, I suspect that the di-iodide can unite with 
thio-urea to form a definite compound. 
(. Issued separately July 18 , 1902 .) 
