SPRAY MATERIALS TO PREVENT DISEASE 



305 



doth in the water near the surface so that the dissolved part will 

 settle to the bottom and cause other water not saturated to come in 

 contact with the crystals. 



Slake the lime in cold water by pouring on a little water at a 

 time until some heat is generated, then pour on enough water to 

 keep it from burning, or becoming dry from the heat. Do not 

 smother the lime during the slaking process. This will prevent the 

 formation of lumps. As the lime becomes completely slaked more 

 water may be added, and stirring should be vigorous and for some 



Fig. 213. — Bordeaux mixture is best made by pouring the two diluted stock solutions 

 together into a third vessel, letting the streams mix in the air. (U.S.D.A.) 



time. When the whole mass has been made of a creamy consistency 

 strain it through a cheese cloth to remove the grit or other particles 

 which will not pass through a fine sprayer. 



These two stock solutions may be kept separate for any length 

 of time. As they are used they should be thoroughly stirred or 

 shaken before mixing. In mixing them dilute each, keeping strict 

 account of the amount of water used, so as to attain the above 

 formula as desired. When the two are diluted enough, pour them 

 at the same time into a third vessel so that the streams will mingle. 

 This causes a more perfect combination (Figs. 213 and 214). 

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