. Bulletin. 1901-13. Agriculture; Agriculture. ADHERENCE OF BORDEAUX MIXTURE. 25 pression of surface of ; A diagram of the comparative depression of mixtures with the 2 pounds of rosin-fishoil soap and without additional adhesives is shown in figure 4. In making the. Fig. 4.—Diagram which compares the average depressions as seen in horizontal micro- scope of the surface films of Bordeaux mixture without added adhesive and Bordeaux mixture with 2 pounds of rosin-fishoil soap to 50 gallons of mixture. X, Median line of eyepiece micrometer which coincides with the surface of the mixt
. Bulletin. 1901-13. Agriculture; Agriculture. ADHERENCE OF BORDEAUX MIXTURE. 25 pression of surface of ; A diagram of the comparative depression of mixtures with the 2 pounds of rosin-fishoil soap and without additional adhesives is shown in figure 4. In making the. Fig. 4.—Diagram which compares the average depressions as seen in horizontal micro- scope of the surface films of Bordeaux mixture without added adhesive and Bordeaux mixture with 2 pounds of rosin-fishoil soap to 50 gallons of mixture. X, Median line of eyepiece micrometer which coincides with the surface of the mixture in crystallizing dish ; Y, graduated scale of micrometer eyepiece; A, average depression of surface film of 4-2-50 Bordeaux mixture without added adhesives by the bloom of the grape; B, average depression of surface film of 4-2-50 Bordeaux mixture with 2 pounds of rosin-fishoil soap to 50 gallons of mixture. measurements given in Table IV the mixture was always well agi- tated beforehand to stir up the precipitate and break up the film of calcium carbonate which formed on the surface. Table IV.—Results of tests shoiving the adhesiveness of Bordeaux mixture to grape J)erries alone and with various added adhesives, as shoion hy the quantity of copper on the berries, the comparative surface tension of various mixtures used as found by weight of a film of the mixture, and the depression of the surface of the mixture by the bloom of the grape. Plat No. Mixture. Weight of copper to a square meter of grape surface. Weight of loop of mixture. Depression of surface Sample A. Sample B. Average. of mixture. 1 4-3-.'^0 "Rnrdeaux mixture Milligrams. Trace. Trace. Trace. Milligrams. Trace. Trace. Trace. • Milligrams. Milligrams. 726 731 737 499 490 593 691 488 MilUmeter. 2 4-3-50 Bordeaux mixture with 2 pounds of ferrous sulphate 4-2-50 Bordeaux mixture 3 4 5 0 Ar-2-CO Bordeaux mixture with 2 pounds of rosin-fishoU soap 4-2-50 Borde
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