304 MAINE AGRICULTURAL EXPERIMENT STATION. 1907. 



pounds of lime in a 50-gallon cask and then fill up with water. 

 (This milk of lime solution should be strained before using.) 

 Fill another cask of equal capacity with water and suspend in 

 this near the top a sack containing 100 pounds of copper sulphate, 

 which will usually dissolve in 24 hours. If thoroughly stirred 

 just before using, each gallon of this stock solution will contain 

 2 pounds of copper sulphate or lime as the case may be. The 

 most convenient method of preparation is to have an elevated 

 platform above the top of the spray cart. Where running water 

 is not available this platform can be built over a small stream 

 or well and a pump connected to the water supply, so placed 

 that it will deliver over the top of a barrel placed on the plat- 

 form. Two other casks in addition to those for the stock 

 solutions are now necessary, each with a piece of hose 3 or 4 

 feet long connected to the bottom. When not in use the outer 

 end of the hose is elevated above and fastened to the top of the 

 cask. When ready to prepare a tank full of mixture, the stock 

 solutions are well stirred and 2,y 2 gallons of concentrated copper 

 sulphate solution is measured into one cask and 2]/ 2 gallons of 

 lime solution into the other and each filled half full for a 50- 

 gallon tank. For a 100-gallon tank 5 gallons each of the stock 

 solutions are used and the casks filled full of water. These 

 casks for the dilute solutions should be at the edge of the plat- 

 form. Now back the spray cart underneath and quickly lower 

 the hose attached to each barrel and insert it in the opening of 

 the tank on the spray cart. The cart is thus quickly loaded 

 and the dilute, cold solutions quickly and thoroughly mixed. 



By following these directions in preparing and applying 

 bordeaux mixture the losses from late blight and the rot asso- 

 ciated with it can be entirely prevented in any ordinary season, 

 while in a season like the one just passed the loss can be reduced 

 to a minimum if the work is thoroughly and carefully done. 



Treating Seed Potatoes with Formaldehyde Gas to 

 Prevent Scab. 



In Bulletin No. 141 of this Station attention was called to a 

 rapid increase of potato scab in Maine during recent years. 

 In discussing preventive measures especial, stress was laid upon 

 the importance of using seed tubers as free from scab spots as 



