EXPERIMENT STATION BULLETINS. 533 



weight and density of liquids. It is made of glass, is about a foot long, 

 and has a graduated scale on the side. 



It is absolutely necessary that the hydrometer be kept perfectly clean. 

 If the solution is allowed to dry on it an accurate test cannot be made. 



It can be purchased from dealers in druggists' supplies or from Bausch 

 and Lomb Optical Company, Kochester, N. Y,, or Whitall Tatum Com- 

 pany, Philadelphia, Pa., or Taylor Instrument Company, Rochester, N. Y. 



(See page 543 for the rates of dilutions.) 



DILUTE LIME-SULPIIUR SOLUTION. 



For spraying on the foliage of apples, pears, European plums and 

 cherries, but not on peaches or Japanese plums, grapes or potatoes. 



This solution can be prepared for use in several ways. 



First, the "Commerciar' concentrated lime-sulphur solution can be 

 diluted to the proper strength. 



Second, "The home made" concentrated lime-sulphur can be diluted to 

 the proper strength. 



Third, The solution can be made at any time and in any quantity as 

 follows: Boil in a few gallons of water for one hour, iirirr as miniy 

 ])ound of sulphur as of lime, strain and dilute with water so there will 

 1)0 8 pounds of sulphur to every 100 gallons. 



Example: To make 100 gallons of spray solution, boil 8 pounds of sul 

 ])hur and 4 pounds of lime as directed. 



SELF-BOILED LIME-SULniUK MIXTURE. 



This is a mixture of lime, sulphur and water and not like any of the 

 other lime-sulphur sprays. It does not (when properly made) injure 

 tender foliage and is very valuable for spraying peaches and Japanese 

 plums. The formula is: 



Luni]) lime 8 pounds. 



Siilplnii- 8 pounds 



s. 



^^■at('r 50 gallons 





The mixture can be i)re|>ared bcKer by using ^52 p(Minds (»!' lime 

 pounds of sulphur, and 8 or 10 gallons of water, and then diluting lo I'OO 

 gallons. 



Place the lime in a barrel and add enough water to almost cover it ; as 

 soon as the slaking begins add the sulphur, which should be run tlirongli 

 a sieve to break up the lumps. 



Stir constantly and add enough water to make a thick i)aste and then, 

 gradually, a thin paste. As soon as the slaking of the lime has vigorously 

 boiled the sulphur for about five minutes, cold water should be added to 

 cool the mixture and prevent further cooking. It is then ready to be 

 strained into the spray tank, diluted up to the full formula, and used. 



Care must be taken not to allow the boiling to proceed too far, if the 

 mixture remains hot for fifteen or twentv minutes after the slaking is 

 completed, too much sulphur will go into solution and injury to the foliage 

 may result. 



The tiine of adding the cold water («» sl(»]t llic boiling depends upon 

 the lime. With a sluggish lime all (lie heat in it ni;iy be needed, while 



