Oidium or powdery mildew of the vine . Fig. 14. Sublimed Sulfur of poor quality. Sulfur No. 4. U2 UNIVERSITY OF CALIFORNIA—EXPERIMENT STATION. «T it * **,. -^ * -? J-JHC ..mUtr Fig. 15. Ground Sulfur of good quality. Sulfur No. Fig. 16. Ground Sulfur of very bad quality. Sulfur No. 8. OIDIUM OR POWDERY MILDEW OF THE VINE. 343 The data given are the prices and the results of the Chancel test,column C. and of the microscopical examination. The Chancel test isthe determination of the amount of settling that occurs when 5 gramsof sulfur are allowed to stand in a cylinder after shaking up with
Oidium or powdery mildew of the vine . Fig. 14. Sublimed Sulfur of poor quality. Sulfur No. 4. U2 UNIVERSITY OF CALIFORNIA—EXPERIMENT STATION. «T it * **,. -^ * -? J-JHC ..mUtr Fig. 15. Ground Sulfur of good quality. Sulfur No. Fig. 16. Ground Sulfur of very bad quality. Sulfur No. 8. OIDIUM OR POWDERY MILDEW OF THE VINE. 343 The data given are the prices and the results of the Chancel test,column C. and of the microscopical examination. The Chancel test isthe determination of the amount of settling that occurs when 5 gramsof sulfur are allowed to stand in a cylinder after shaking up with 25cubic centimeters of ether. The number represents the percentage ofthe height of the cylinder occupied by the sulfur after settling. It isa very convenient and quick method of testing the fineness of the sul-fur. (See fig. 17.)
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