302 AGRICULTURE. 



being white, it can be more readily seen on the 

 foliage, thus indicating what has and what has 

 not been sprayed. It is made as follows : 



Arsenate of soda 4 ounces 



Acetate of lead 11 ounces 



Water 25-100 gallons 



Glucose 2 quarts 



Dissolve the acetate of lead in a wooden bucket 

 of warm water, and the arsenate of soda in 

 another bucket of warm water. When thor- 

 oughly dissolved, pour both into the quantity 

 of water to be used, according to the strength 

 of the poison desired, at the same time stirrine 

 rapidly. If two quarts of glucose be added, the 

 spray will not be so easily washed off by rains. 



In applying any of the arsenical mixtures, the 

 spraying should not be continued until the water 

 drips from the foliage, as the fine particles of 

 poison are carried away in the drops instead of 

 being left upon the leaf by evaporation after a 

 less quantity is used.* 



Group II. — Contact Insecticides, or those that 

 kill by contact with the body of the insect. 



These may be effective in two ways, either by 



*DusT Sprays. — White Hellebore the root of a plant, kills 

 both by contact and by poisoning. 



It may be applied dry or in the liquid form. If used dry, it 

 may be easily applied by mixing it with three or four times its 

 weight of fiour and dusting it over the plants when they are 

 moist with dew, from a little cheese-cloth sack or applied with a 

 hand dust-spray or bellows. 



Paris Green may be used dry by mixing it with ten times its 

 weight of flour, and may be applied in the same way as the 

 Hellebore. 



