12 
offensive. In the ffasks kept at room temperature the changes were 
similar to but not so marked as in the incubator series. 
Zinc chloride is still less efficient as a deordant in the presence of 
organic matter of vegetable nature. Some flasks were prepared as 
above with the addition of particles of vegetable matter, such as cab- 
bage, etc., and kept at room temperature. In the flasks containing 
dilutions of 1:300 the odor gradually increased as the vegetable matter 
underwent decay until about the seventh day. when the odor was very 
offensive. Xo odor was appreciable in strengths of 1:50. 
In dilutions of 1 : 200 the vegetable matter was preserved at the end 
of 11 da}"s and the odor was very mild in comparison with the odor 
from the flasks containing the dilutions of 1 : 300. In those flasks that 
contained a less percentage of zinc chloride than 1:200 the degree of 
odor and the time necessary for decay and disappearance of the veg- 
etable matter varied inversely as the proportion of zinc chloride added. 
The deodorizing value of zinc chloride was next determined in the 
presence of less organic matter than the above experiments. For 
this purpose ordinary bouillon was inoculated with garden earth con- 
taining various organisms and allowed to stand at room temperature, 
under which conditions chloride of zinc will inhibit the production of 
foul odors in strengths of about 1:500. 
ANTISEPTIC PROPERTIES. 
For this purpose Erlenmeyer flasks of about 100 c. c. capacity were 
partly tilled with nutrient bouillon and the zinc chloride added in vari- 
ous delinite percentages. 
When prepared in this way the chloride of zinc produces a white ' 
flocculent precipitate, which, on standing, settles to the bottom, leav- 
ing the upper portion of the liquid its original straw color and making 
it possible to observe any bacterial growth that may take place. The 
quantity of this precipitate varies directly as the quantity of chloride 
of zinc added. 
The flasks having been prepared in this way were abundantly inocu- 
lated with different materials rich with organisms such as wisps of 
hay, fresh stable manure, garden earth, etc., and placed at room tem- 
perature. From day to day, up to the end of the fourteenth day, the 
appearance of molds and bacterial growths was observed. In case of 
doubt as to bacterial growths, hanging drop preparations were exam- 
ined under the microscope. 
