332 Wisconsin Academy of Sciences , Arts, and Letters. 
of the metal in the solvent used, hut rather is to he attributed 
primarily to the chemical individuality of the metal, as well as 
that of the solution. 1 
The solution of HOI in benzene conducts the electric current 
approximately one-fifth as well as a dry air gap, when tested 
with 110 volts direct current with electrodes one millimeter 
apart. 
Tin i Tetrachloride as Solvent. —Schuchardt’s SnCl 4 was 
treated as described in method 1. The pure solvent is without 
action upon magnesium, chromium, manganese, aluminum, 
zinc, cadmium, iron, nickel, tin, lead, copper, antimony, bis¬ 
muth, arsenic, silver, gold, platinum, palladium, tellurium, 
calcite, or witherite. The solution of HC1 in this solvent is 
also without action upon the above metals and carbonates. The 
conductivity of the HC1 solution was tested with 110 volts 
across one millimeter and gave a deflection of one volt division 
on the Jewell voltmeter corresponding to a current of 0.00005. 
Attention is called to the fact that this solution exhibits a higher 
conductivity than either benzene or ethyl chloride, and yet the 
benzene solution and the ethyl chloride solution act vigorously 
upon the zinc and slightly upon the cadmium, while the SnCl 4 
solution of HOI is entirely without action. 
Silicon Tetrachloride as Solvent. —Schuchardt’s Si01 4 was 
treated as described in method 1. The pure solvent does not 
act upon magnesium, aluminum, zinc, cadmium, iron, nickel, 
tin, lead, cobalt, silver, platinum, palladium, or tellurium. Hb 
gas was evolved upon any of the metals when HC1 was run in. 
Copper was blackened and after standing three and three- 
fourths hours lead was corroded white. All the other metals 
remained perfectly blight during eight and one-fourth hours 
after the HOI was run in. The SiCl 4 alone, and the HOI solu¬ 
tion conduct electricity less than a dry air gap as tested by 110 
volts across one millimeter. 
Calcite and witherite are not acted upon by the HOI solution. 
1 Compare. L. Kahlenberg Jour, Phys. Chem. 6, 1, 1902, pp. 1-14; also 
M. Gomberg, Amer. Chem. Jour. 25, 324 (1901). 
