380 



STATE BOAHD OF AGRICULTURE. 



4. The titration of the solution with acid, preparatory to making the 

 thiosulfate sulfur determination, is made unnecessary. 



5. A method of determining the calcium oxide present by computa- 

 tion from the decinormal iodine used for the thiosulfate and monosulfide 

 sulfur determinations and from the sulfate and sulfite present. 



PART li 



MANUFACTURE AND STORAGE OF HOME-MADE SOLUTIONS. 



During the past year many demands were made upon the chemical 

 division of the Experiment Station for some specific information on 

 certain points in regard to the manufacture and storage of the lime- 

 sulfur spray. As the literature of the subject did not furnish the de- 

 sired information the investigations detailed in the following pages 

 were undertaken. 



No experiments were undertaken bearing upon the length of time the 

 solution should he boiled as the experience of previous investigators on 

 the subject has been that the maximum of sulfur in solution is obtained 

 by boiling from 45 minutes to one hour. 



EFFECT OF LIME ON THE COMPOSITION OF THE LIME-SULFUR SOLUTION. 



In order to determine the value of the various limes found in the 

 Michigan market, samples of lime-sulfur were made up from six brands 

 of lime. With two exceptions, two batches were made up from each 

 brand, one according to the formula, 60 pounds of lime, 125 pounds of 

 sulfur and 60 gallons of water, and the second according to the formula 

 50-100-50, these being the formulae commonly used. The lime-sulfur 

 was made up in barrel lots in a w^ooden tank built for the purpose, steam 

 at 45 pounds pressure being used as the boiling agent. The solutions 

 were boiled for one hour. Allowance was made for the condensation of 

 tlie steam so that the lime-sulfur and water would be in the above men- 

 tioned proportions at the finish. The limes used were: 1. Kelly Island 

 Lime. 2. A special low magnesia lime put out by the Michigan Lime 

 Co. 3. Crescent Brand Lime. 4. Ohio and Western Co's Lime. 5. 

 Kelly Island Lime and Transport Go's Lime from White Rock, Ohio. 

 6. Bay Shore Superior Lime. 



These limes showed the following analyses for calcium oxide and mag- 

 nesium oxide. 



TABLE IV. 



