33 



Ai'sviiious acid 08 to 63 per cent. 



Lime 14 " IG " 



Copper oxide 7 " 8 " 



Arsenious acid soluble in wateronlinary temperature 3 " 4 " 

 " " " " '' boiling [loiut 15 " "20 " 



lu view of the greater solubility of the arsenious acid in this 

 material at a high temperature more care may be needed to avoid 

 increasing the temperature of the liquid with which it is used. 



KEROSENE EMULSION. 



Formula. ^ lb. common bar soap, 



2 gallons common kerosene. 

 Cut the soap into small pieces or shavings and dissolve in about 

 two gallons of hot water. While still hot, pour in the kerosene and 

 with the hand pump or syringe, pump it back and forth until a thick 

 butter-like substance is formed, lu this condition the kerosene is 

 divided iuto very minute globules and will be readily diluted or 

 suspended in water. 



Before using, add water enough to make 



(A) 10 gallons of emulsion 



(B) 20 " " " 



EQUIPMENT FOR SPRAYING. 



Pumps. To obtain the best results, both insecticides and fungi- 

 cides should be put on in as fine a spray as possible. When any 

 liquid is applied in a stream, much of it runs off and is wasted, while 

 if put on in a fine mist it adheres in minute drops which, when dry 

 are held firmly by the hairs and uneven surfaces of the leaves. 



In different sections of the country, pumps are being manufactured 

 especially adapted for the application of fungicides and insecticides 

 and many of them have reached a good degree of perfection. With- 

 out advertising any one of them as superior to others, we would 

 advise purchasing from reliable manufacturers and those located as 

 near home as possible. This last is very important that in case of 

 breakage or injury, parts of the pump may be obtained in as short 

 time as possible. 



KNAPSACK PUMP. 



The knapsack or the small garden pumps are found very efficient 

 for small trees when closely planted or where only a small number 

 are to be treated, but for large trees and in plantations of consider- 

 able extent the barrel or power pump is more economical. 



BARREL AND POWER PUMP. 



The hand pump attached to a barrel or tank and mounted on a low 

 wagon or stone-boat is largely used and when worked in a systematic 

 manner is very satisfactoiy. IMany efforts however, have been made 

 to improve on this method which have resulted in the production of 

 several power spraying pumps, some of which are run by gearing 

 attached to the wheels and others by a small engine mounted on a 

 low truck. One of the most approved forms of the former has been 



