Plant Diseases ajid Insects. 



95 



"The London purple used in the Bordeaux mixture pro- 

 duced .02 injury at the rate of i lb. in 25 gallons of water, and 

 none at all at a less strength. No chemical reasons for this 

 difference in results are given. Analyses and experiments 

 made at the New Jersey Station show that the addition of 

 lime to London purple combines the soluble arsenic, forming 

 with it an insoluble compound, and that only a mere fraction 

 of I per cent will not so combine. This is really one of the 

 most valuable results of the work of the year and will make 

 London purple available at more effective strength than has 

 been heretofore deemed prudent. 



''This report would not be complete without a notice of 

 letters patent No. 440,612, dated November 11, 1890. This 

 was granted to Frank Jones, Morse, Kansas, on a wonderful 

 ' Process of Disinfecting for Destroying Insects on Trees and 

 Plants.' This consists in washing the body and limbs of the 

 plant or tree, with a mixture or compound of the following 

 ingredients in the specified proportion, to wit: soft water, 

 five gallons; indigo, dissolved in the water, one ounce; as- 

 afoetida tincture, three ounces ; soap, dissolved in the water, 

 two one-pound bars, and at or about the same time drenching 

 the roots of the tree with the following drench mixture applied 

 in connection with sulphur, as hereinafter specified, to wit : 

 Water five gallons; concentrited lye sixteen ounces; indigo 

 one and one-half ounces ; camphor tincture, four ounces, and 

 sulphur, a sufiicient quantity. In practice the sulphur is not 

 mixed with the compound except in the act of applying, and 

 the method of applying is as follows : In treating a tree six 



