330 Report of the Horticultural Department of the 



This latter appears to give the best powder. The operation is well 

 described by Dr. Bird in Bulletin 60 of the Missouri Station. His 

 directions are here given : 



1. " Break up into small lumps about seventy or eighty pounds of 

 quicklime and spread it out so that it will become air-slaked. When 

 slaked and perfectly dry sift it through the fine sieve (100 meshes). 



2. " Completely dissolve four pounds of copper sulphate in two 

 and a half gallons of water. The easiest way is to suspend the 

 sulphate in a coarse bag just below the surface of the water until it 

 is dissolved. 



3. " Pour gradually two and a half gallons of water over four 

 pounds of good quicklime in such a manner as to slake it to the finest 

 powder and give a good milk of lime solution ; let it cool. 



4. " Put sixty pounds of the sifted, air-slaked lime into a shallow 

 box, one in which the material can be well worked with a hoe or 

 shovel. 



5. " Pour the well-stirred milk of lime and the copper sulphate 

 solution at the same time into a third vessel and stir until the whole is 

 thoroughly mixed. It will have a deep blue color and be thick. This 

 is so finely divided that it will remain in suspension for hours. 



6. " Pour this immediately into a double flour-bag filter and 

 squeeze out most of the water. [This consists of two close-woven, 

 cotton flour bags, one slipped inside the other, with which the blue 

 material is filtered.] 



7. '' Empty this wet, blue material at once {do not let it dry) into 

 the sixty pounds of air-slaked lime and' work it up so that it will be 

 well distributed. If the resulting mixture is too moist add more air- 

 slaked lime. 



8. " Rub this through a coarse sieve (25 mQsh)7vJiile still some- 

 what damp, mix thoroughly and spread out to dry. 



9. "When perfectly dry sift it through a fine sieve (100 mesh), 

 crushing all lumps. All of this can readily be made to go through 



