. Minnesota plant diseases. Plant diseases. 2I( Minnesota Plant Diseases. the blade of a penknife in the mixture, allowing it to remain for at least one minute. If metallic copper forms on the blade, or, in other words, if the polished surface of the steel assumes the color of copperplate, the mixture is unsafe and more lime must be added. If, on the other hand, the blade of the knife remains unchanged, it is safe to conclude that the mixture is as perfect as it can be made. As an additional test, however, some of the mixture may be poured into an old plate or saucer, and while held between th
. Minnesota plant diseases. Plant diseases. 2I( Minnesota Plant Diseases. the blade of a penknife in the mixture, allowing it to remain for at least one minute. If metallic copper forms on the blade, or, in other words, if the polished surface of the steel assumes the color of copperplate, the mixture is unsafe and more lime must be added. If, on the other hand, the blade of the knife remains unchanged, it is safe to conclude that the mixture is as perfect as it can be made. As an additional test, however, some of the mixture may be poured into an old plate or saucer, and while held between the eyes and the light, the breath should be gently blown upon the liquid for at least half a minute. If. Fig. 106.—A gear-power force pump. (Victor Spraying Machine.) the mixture is properly made, a thin pelHcle, looking like oil on water, will begin to form on the surface of the liquid. If no pellicle forms more lime should be ; (B. T. Galloway.) It is very important that good Hme be used. Stock solu- tions of the lime and copper sulphate may be prepared, and may be kept several weeks without deteriorating. "To make stock solutions, dissolve fifty pounds of copper sulphate in fifty gal- lons of water. In another barrel slake fifty pounds of good stone lime and add enough water to make fifty gallons. These barrels should be tightly covered to prevent Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Freeman, Edward Monroe, 1875-. Saint Paul, Minn.
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectplantdi, bookyear1905
