alternated instead of mixing perfectly, as the alternating white and 

 yellow color of the stream plainly showed. 



The result of this treatment was better than was expected under 

 the circumstances, 43.2% of the trees being freed from scales. But 

 if we consider that crude oil is an expensive material ; that double 

 tank pumps are not generally owned by the fruit growers ; that any 

 of these pumps may prove to be as unreliable as the one used for 

 these experiments ; and finally that better results can be obtained 

 from other and nearly as cheap materials without the necessity of 

 using a double tank pump, it would not seem advisable to use crude 

 petroleum. 



Kerosene. With kerosene the same difficulties were met as with 

 crude petroleum though to a less degree. Variation in the percent- 

 age of oil ranged from 18 to 38 with the pump set for 30. Perhaps 

 the fact that the amount of variation was less than with the crude 

 petroleum is the explanation for the somewhat better results obtained, 

 44.4% of the trees being freed from the scales. The same objec- 

 tions as those named for the crude oil hold, however, for kerosene. 



Lime, Sulphur and Salt Wash. This mixture was prepared as fol- 

 lows : 10 lbs. of fresh stone lime and 20 lbs. of sulphur were boiled 

 in 20 gallons of water in a farmer's kettle for an hour and a half, 

 the mixture being frequently stirred. Thirty pounds of lime were 

 thoroughly slaked with hot water and 15 lbs. of salt were then added 

 and stirred till the salt had all dissolved. This lime and salt mix- 

 ture was then added to the lime and sulphur mixture and the whole 

 was stirred and heated for half an hour more. It was then strained 

 through burlap into the spraying tank, and water to make 60 gallons 

 added. It was then ready to put on to the trees, and sprayed easily 

 through a fine aperture Vermorel nozzle. 



The objections to this material are : it is "necessary to have a large 

 kettle holding 50 or 60 gallons, in which to make it, unless some 

 boiler is available where it can be boiled with steam ; it is difficult to 

 strain, the burlap becoming completely clogged by the time four or 

 five gallons have bfeen strained ; the time required to prepare it is 

 considerable — probably averaging at least four hours for each lot ; 

 and its action on pump and hose is very corrosive, calling for frequent 

 repairs. It is inexpensive, however, so far as the materials go and 

 gave excellent results, 65.6% of the trees treated being freed from 



