1911.] PUBLIC DOCUMENT — No. 31. 175 



acconipli.sli this it is suggested that those using a power outfit 

 employ an agitator of the propellor type, as most others will 

 allow a little settling; and where this occurs an eveu mixture 

 of the sjH'aying materials is not obtained. 



Directions. 



The following method has been found to woi'k out satisfacto- 

 rily in making 250-gallon quantities. First, weigh out AO 

 pounds each of good stone lime and flour of sul])hur. Take the 

 above (piantity of lime and place in the bottom of a barrel (one 

 holding 50 gallons is a convenient size to use Avhen not making 

 over 300 gallons at a time) ; then pour on water slowly and 

 evenly. A good way to do this is to use a fine spray from a 

 nozzle. As soon as the lime begins to slake have the sulphur 

 sifted over the lime, adding just enough water while doing this 

 to keep the lime from burning. By the time the sulphur is 

 added the lime has become very active, and requires one per- 

 son's attention to stir the mixture while another adds the water 

 just fast enough to keep the mixture from burning. AVatcr 

 should be added cautiously to obtain the best results in slaking. 



If the above directions are followed there will first be a thick, 

 pasty substance which gradually becomes thinner as more water 

 is added. The lime ought to keep the mixture well heated for 

 several minutes, but as soon as it becomes well slaked water 

 should be added. If allowed to cook too long the sulphur will 

 go into solution and combine with the lime to form sulphides, 

 and this form is harmful to the foliage. Weigh out 10 pounds 

 of arsenate of lead, add water, aud stir until thoroughly mixed ; 

 then strain through a sieve (20 to 30 mesh to an inch is satisfac- 

 toi-y) either into the s])ray tank or Ijarrel containinji' the lime- 

 sulphur mixture. On the addition of the arsenate of lead to the 

 lime sulphur, a dark-colored mixture is obtained. If the mix- 

 ture has been pro]ierly made there will be very few settlings, 

 and very little, if any, sulphur floating on the surface. The 

 ingredients of this mixture ought not to settle for nearly half 

 an hour. The above mixture should be strained into the spray 

 tank and the tank filled with water. The solution is then ready 

 to be sprayed on the trees. 



