158 PEACH LEAF CURL: ITS NATURE AND TREATMENT. 



spray required bj- the formula, and this is then drawn oil'. Before a 

 new charge of spray materials is placed in the barrel, the latter should 

 be removed from beneath the steam pipe and cleaned. Convenient 

 boilers suited to boiling one or more barrels of spray are shown in the 

 illustrations given. (PI. XXI.) 



For orchards of 100 acres the boiling of sprays in barrels is too 

 slow. The plan adopted by Mr. A. D. Cutts, at the Riviera Orchard, 

 will here be given as admirably answering the purpose for such 

 orchards. In this spray -boiling plant the live steam is obtained from 

 the dome of the boiler of a 20-horsepower thrashing engine, and 

 while cooking sprays from 60 to 80 pounds steam pressure is main- 

 tained. The spray is boiled in two rectangular vats or tanks, built of 

 2-inch dressed sugar pine. The inside measure of these tanks is, 

 length 5 feet, breadth 3 feet, depth 30 inches. These tanks have the 

 ends mortised into the side and bottom planks from one-fourth to 

 three-eighths of an inch. Two long bolts run diagonally across at each 

 end to hold the head in place, and in addition the planks are nailed 

 together with 10"^ cut nails. Each of these tanks will hold approxi 

 mately 280 gallons of spray. They are raised 4 feet above the ground 

 upon a strong and well-braced framework. They stand side by side 

 with a platform between about -1 feet wide, on which a man maj' stand 

 to attend to the spray while boiling. One end of each tank is toward 

 the boiler, and the other, which is supplied with a faucet or sirup 

 gate for drawing off the spray, extends to the side of a driveway. 

 The steam is supplied to each of the tanks directly from the dome of 

 the boiler. From the steam dome a 1^-inch pipe leads to near the 

 ends of the tanks. This is connected with a transverse 1-inch horizontal 

 pipe extending laterally to a point opposite the center of each tank and 

 level with the tops of the tanks. The ends of this 1-inch pipe now turn 

 at a right angle and extend to the center of the top of the ends of the 

 tanks, turn down on the inside of the tanks to the bottom of the same, 

 and then extend along the center of the bottom to near the farther end, 

 where they are closed by having an iron cap screwed over the end. 

 Through each side of that portion of the 1-inch pipe which extends 

 along the inside of the bottom of each tank are drilled 6 small holes 

 for the escape of the steam into the tanks. In the pipe leading to 

 each tank is placed a globe valve for separatel}" controlling or prevent- 

 ing the flow of steam to each of the tanks. When a tank of spray is 

 ready to go to the orchard, the spray is run into another tank situated 

 on a low truck wagon, the truck being first driven under the end of 

 the boiling tank which is to be emptied. The low truck with the 

 spray is then driven to the spray tanks in the orchard, and the spray 

 is pumped from the truck tank to the spray tank, without delaying 

 the work of the spraj^ers. The spray is strained twice, fii'st when drawn 

 off from the boiling vats through the faucet, and second when it is 



