354 PLUM. 



lating, until it will be too strong as the mixture reaches 

 the bottom. 2ndly, the other point is to insist upon the 

 mixture not being made too strong ; 1 lb. to 200 gallons 

 I find very useful, and I never use stronger than lib. to 120 

 gallons." 



For distrihution of the spray engines or pumps fitted with 

 what are known as " cyclone nozzles," and especially the form 

 known as the " Eiley cj^clone nozzle," are considered to be 

 the best. We have been much held back in our experiments 

 by difficulty and delay in getting the most desirable kind of 

 apparatus, but so far this has been satisfactory, that work has 

 been successfully carried on with ordinary engines. There- 

 fore, there is no drawback on this head in adoption of the 

 application by all who have not convenience or desire to 

 procure the more elaborate apparatus ; but when the 

 implement known as the Strawsonizer is issued, which can 

 deliver dry or fluid dressings, as the lightest possible film 

 or dew on every part of the tree and beneath or above the 

 leaves, this may be expected to be of great service as a broad- 

 scale distributor. 



With regard to the nature of Paris-green. — "Paris-green" is 

 an aceto-arsenite of copper, and of a poisonous nature, and 

 therefore should be used with care in mixing, and should not 

 be applied to fruit, or to vegetables that are used for food ; but, 

 as will be seen in the directions for use, the quantity advised 

 for orchard-use in the Canadian Government Eeport, to check 

 looper-attack on leafage, is very small ; and our English 

 experience of this year has shown that it can be as safely used 

 here (with proper care) as it has now been used for regular 

 farm and orchard work for many years, over an area of many 

 thousands of miles, in the Continent of America. 



On application to Messrs. Blundell & Spence, of Hull, as 

 being well-known manufacturers and great exporters of Paris- 

 green, Mr. J. Dixon (Manager) wrote me on December 31st, 

 1889 : — " Emerald-green, Paris-green, Schweinfurth-green, 

 are different names for the same thing. The first name is 

 English, and is the one used in most of our Colonies, India, 

 and China ; the second is the American term ; the third 

 only used in Germany, and by German traders. 



"Emerald- or Paris-green is a double salt of arsenite and 

 acetate of copper — in other words, an aceto-arsenite of copper. 

 You may take the U.S.A. analysis of Paris-green as correct. 



*' The pure article (which is that used as an insecticide) is 

 a true crystal, and varies in colour from a deep to a pale 

 green, according to the size of the crystals." 



Mr. Dixon also favoured me with the following percentage 

 analysis of pure Emerald-green : — 



