Minnesota Plant Diseases. 



229 



bag and suspending it just below the surface of the water until 

 dissolved. This is to be kept in a vessel by itself. 



"Slack four pounds of good quicklime by sprinkling over it 

 slowly two and one-half gallons of water in such a manner as 

 to slack the lime to a fine powder and give as a result a milk of 

 lime solution. This must now stand until cooled before 

 using it. 



"In a large shallow box one should then place sixty pounds 

 of the sifted, air-slacked lime which has already been made as a 

 stock carrier. In another vessel pour the milk of lime and the 

 copper sulphate solution, both at the same time, and stir thor- 

 oughly until the whole is well mixed. Then turn this into a 

 double flour sack and squeeze out most of the water. 



"Empty this blue material just made into the sixty pounds of 

 air-slacked lime, and at once work it up thoroughly with a hoe. 

 If after this has been thoroughly mixed the material is too wet 

 more of the lime dust should be added. This material must 

 then immediately be rubbed through a comparatively coarse 

 sieve while it is still somewhat damp. It should then be thor- 

 oughly mixed again by means of a stick and spread out in a dry 

 place and allowed to dry. When this is perfectly dry it must be 

 sifted through a fine sieve of a hundred meshes, in which case all 

 lumps can be ground by means of a stick rubbed over the sieve. 

 The resultant powder should have a uniformly blue color. In 

 case it looks streaked or mottled, it should be stirred until all of 

 the mixture is of a uniformly blue color. This powder, now 

 completed, will keep indefinitely in a dry place, and contains 

 copper sulphate in the same chemical combination as is found 

 in the liquid bordeaux mixture. There is a large excess of 

 powdered lime in this which is not in chemical combination 

 with copper, but which is there simply as a carrying agent. " 

 [Country Gentleman, Aug. 13, 1903.] 



SPRAYING APPARATUS. 



The selection of spraying apparatus is a subject upon which 

 no extensive advice can be offered here but which is best left 

 entirely to the ingenuity of the plant grower. A few general 

 principles as laid down by those who have paid considerable at- 



