taining loO gnllons of water, when a chemical reaction will take 

 place forming arsenate of lead as a pure white powder in suspension 

 in the water." (If the common 50 gallon barrel or cask is used the 

 formula would be 3f oz. acetate of lead and 1-| oz. arsenate of lead.) 

 " If cold water be used the solution of acetate of lead will require 

 a little time, but however, if the water be hot it will dissolve quickly. 

 It is customary to add ftom 2 to 4 qts. of glucose to the above 

 amount of water to make the poison adhere more iirmly, but this 

 may not be necessary. If it is desired to use larger proportions of 

 the arsenate of lead it is only necessary to use more acetate of lead 

 and arsenate of lead, but ahvays in the proportion given above." 



KEROSENE EMULSION. 



Formula. ^ lb. common bar soap. 



2 gals, common kerosene. 



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

 2 gallons of hot water. While still hot, as nearly boiling as ^wssihle, 

 pour in the kerosene and with the hand pump or syringe, pump it 

 back and forth until a thick cream-like substance is formed. In this 

 condition the kerosene is divided into 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 gallons of emulsion. 



Formula A, to be used when the insects are in large numbers and 

 the foliage is known not to be easily injured by it. Formula B, 

 under other conditions. 



KEROSENE AND WATER. 



It has been found by numerous experiments that clear kerosene 

 mixed with water if applied upon a bright clear day and in a condi- 

 tion of fine mist so as not to form drops may be used without injury 

 to the foliage of most of the trees attacked by aphides and other 

 sucking insects, the pear tree psylla and scale insects. This insecti- 

 cide however cannot be recommended unless it is applied with an atom- 

 izer or with a pump by which a definite quantity can be applied. The 



