Some Grape Troubles of Western New York. 451 



two are ready they can be poured the one into the other and then 

 thoroughly stirred. 



Another way of making the Bordeaux mixture has recently 

 come into use. The sulphate of copper is used at the same rate 

 as above but it is dissolved so that every gallon of the solution 

 shall contain one pound of the sulphate. Then for the above 

 formula six gallons would be taken and to this milk of lime is 

 added until the ferro-cyanide of potassium will not discolor the 

 mixture when a drop or two are added to it. So long as there is 

 not sufficient lime present the test will show a dark brown dis- 

 coloration where the material falls. When enough lime has been 

 added no change takes place. The test solution is made by dis- 

 solving about an ounce of the ferro-cyanide of potassium in a pint 

 of water. Only a drop or two need be used at a time, when 

 making the mixture. I should recommend adding more lime than 

 the test shows to be necessary, for from the experience of the past 

 season the Bordeaux mixture has in some cases done serious dam- 

 age to fruit. This subject will be more fully discussed in a future 

 bulletin. 



Ammoniacal Carbonate of Copper. 



Carbonate of copper, one ounce. 



Ammonia, enough to dissolve the copper. 



Water, nine gallons. 



The copper carbonate should first be moistened with a little 

 water and the ammonia then added. This stock solution should 

 be kept tightly corked until used. It will keep indefinitely. 

 When wanted, dilute to the required extent with water, and apply. 



Iron Sulphate and Sulphuric Acid Solution. 

 (^French, for Ajithracnose). 



Sulphate of iron, no pounds. 



Sulphuric acid (commercial), i quart. 



Water (hot), 26 gallons. 



First pour the acid upon the iron crystals and then add the hot 

 water. As soon as the crystals are dissolved the solution is ready 

 for use and should be applied the same day if possible. Do not ap- 

 ply this by means of metal apparatus for the acid will corrode 



