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69 > Image 69 of Annual report. 1910

Part of Kentucky Agricultural Experiment Station

. 20 Bulletin N0. 147; A _ l it with a little warm water. It may then be allowed to dry Q before planting. Y _ * _ , BISULFID OF CARBON. A _ As sold by druggists and manufacturers ithis is a brown- ish Huid which quickly disappears in the air when exposed in an open vessel. Itsdisagreeable odor is due to impurities, since the odor of pure bisulfid of carbon is not unpleasant. ~ i The fumes are not only poisonous, but are inflammable, so ] that some care must be exercised in handling the fluid. It has proved of special service as a remedy for grain weevil, 1 . bean weevil and other insects attacking stored seeds, and 1 has been quite extensively employed for the_ destruction of l A the Phylloxera of grapevines in Europe, for the Woolly Aphis, for ants, and even for the clothes moth. llts great l value for such purposes comes not only from its effective- l ness in destroying all insects, but also because it is not Q corrosive and is otherwise not injurious to seeds, fabrics and other objects fumigated. The offensive odor is soon gone _ if objects that have been exposed to the fumes are thorough- ly aired. It cannot be used for fumigating plants infested with insects because of its destructive effect on the plants themselves. l A _ . About one fluid ounce shouldbe used on each bushel of i ` seed, and may be poured over the seeds or simply placed in a saucer or other open vessel set on their surface. It is ' absolutely necessary that the seeds be enclosed in a tight ll box or bin to get satisfactory results, and the time of expo- sure should not be less than two hours. . The bisulfid of carbon may be bought in quantity of Edward R. Taylor, of Penn Yan, New York. ' I HYDROCYANIC ACID GAS. A This gas is made from cyanide of potassium (98 per cent.), commercial sulphuric acid of good grade, and water. The A gas produced is very poisonous as are also the cyanide of