54« ANNUAL. REPORT OF THE Off. Doc. 



perly be doue by any spraying apparatus that will throw a genuine 

 spray or mist. A knapsack sprayer should be on every farm. 



2, London Purple. This is mostly composed of an arsenite of lime, 

 and contains about forty-two per cent, of arsenic. It is therefore not 

 as strong as Paris green and is cheaper, A little more of it must be 

 used in making up mixtures, and the lime should never be omitted. 

 It is to be applied either as a powder or liquid, just as is Paris green. 



In applying nearly all insecticides used with water it should be 

 remembered that they are not dissolved but are merely held in me- 

 chanical suspension, and it is therefore a mixture instead of a solu- 

 tion. The liquid should be well stirred frequently to prevent the 

 poison settling at the bottom. If it is not stirred often it will settle 

 at the bottom of the vessel and the last to be used will be much 

 stronger than the first. 



3. Arsenate of Lead. Do not put this into metal vessels or they 

 will be corroded. Wood or glass can safely be used. Formula: 



4 ounces of 50 per cent, arsenate of soda. 

 11 ounces of acetate of lead. 



150 gallons of water. 



Dissolve the acetate of lead and arsenate of soda separately, each 

 in four quarts of water, in wood, glass or earthenware, then stir them 

 into the remainder of the water in the larger vessel. Apply as a 

 spray as with other poisons. All such substances should be labelled 

 and kept out of the reach of children, poultry or live stock, as they 

 are deadly poisons. If they were not poisonous they w^ould be of 

 no avail for the purposes to which we propose to put them. 



It is safe to spray all plants, even cabbage, with such applications, 

 but they should be well washed with dashing water before being 

 eaten or should not be gathered within two weeks from the time of 

 the last application. 



4, Arsenite of Lime. This can be made according to the following 

 formula: 



1 pound white arsenic. 



2 pounds quick lime. 

 1 gallon water. 



Boil this mixture forty-five minutes. (It will not injure metal,) 

 Keep it in a closed vessel, as a jug, properly labelled "Poison,'' and 

 whenever it is needed use it in proportion of one quart to fifty gallons 

 of water. It can be kept as long as desired, and will be found quite 

 effective for all kinds of biting insects. We have not yet had op- 

 portunity to try this substance, but it is so highly recommended by 

 those who have tried it that we do not hesitate to endorse it as a 

 first class insecticide. 



5. The Bordeaux Mixture and Paris Green: This has the advant- 

 ag(j of being both a fungicide for plant diseases and an insecticide 



