24 
The union of zinc chloride with hydrogen sulphide is not stable 
enough to recommend it for the neutralization of this offensive com- 
pound. 
The antiseptic powers of zinc chloride are feeble. 
'Prepared in nutrient bouillon a percentage of about 1:40 is required 
to inhibit the growth of molds for 14 da}"s, while under the same con- 
ditions a strength of 1:125 is required to inhibit for the same length 
of time bacterial development. 
Added to ordinary sewage, zinc chloride will inhibit bacterial growths 
in proportions varying from 1 : 500 to 1 : 200, depending to a certain 
extent upon the quantity of nutrition present. 
Chloride of zinc can not be relied upon for destroying micro- 
organic life, as the B. coli communis is not killed in a 5 per cent 
solution in 1 hour’s exposure, and it takes 10 minutes for a 25 per 
cent solution to kill the same organism. 
It requires 30 minutes for a 25 per cent solution to kill Stajyhylococcm 
yyogeiies aureus. 
Spores of B. subtilis are not killed in a 100 per cent solution in 30 
da}^s, and the spores of B. anthracis are not killed in a 50 per cent 
solution in 40 days. 
Zinc chloride has some properties as a deodorant to recommend 
it favorablv, but its antiseptic and germicidal powers are compara- 
tively feeble, which, with its cost and caustic properties, practically 
eliminate it from the useful and reliable disinfectants. 
O 
