and fruit with a film of the material, if the operation is* 

 continued beyond this point and dripping ensues, the leaf 

 edges, and occasionally the entire leaf, will be destroyed by 

 what may be termed arsenical burning. This is caused by 

 an excessive amount of the arsenical being deposited where 

 the running together and dripping occurs. 



Dusting Paris Green. Paris green is also used success- 

 fully in certain cases by dusting it upon the plant. Thi& 

 method is especially to be recommended where low growing; 

 plants, such as Irish potatoes, are to be protected from 

 leaf-eating insects. When the dusting method is employed 

 the poison should be mixed with some diluting material, 

 such as hydrated 1'me (lime dust) flour or even fine road- 

 side dust. The poison should be u^ed in not greater quan- 

 tity than four pounds of Paris green to fifty pounds of the 

 dilutant and generally one half this strength w 7 'M be fouiid 

 effective. The mixture can be successfully and economical- 

 ly applied to such low growing plants by placing it in a 

 bag made of some loosely woven material and then shaking 

 the bag over the plant that we desire to protect. The work 

 should be done in the early- morning while the plants are- 

 yet wet with dew so that the poison will stick to them. 

 This is of course a primitive way to distribute poisons in- 

 the dust form but there are very effective dusting machines- 

 rnada and obtainable by those who desire more up to date 

 appliances. 



Arsenate of lead. The arsenate of lead is also an in- 

 soluble arsenic compound and in the matter of possible 

 damage to foliage is rather to be preferred over the Paris* 

 green. It is slightly more expensive than the latter ma- 

 terial but requines no lime for its preparation and, when* 

 fresh, is somewhat easier to mix with water than is Paris- 

 green. It can be used as a spray at the rate of one and one 

 half pounds arsenate of lead to one hundred gallons of 

 water. At this rate its insecticidal value is good. Arsen- 

 ate of lead is sold under various trade names and is com- 

 mercially prepared for spraying purposes. It is not made 

 in a dry form and cannot be used in the dusting method. 



