I 



SOME SPRAYING MIXTURES. 



Since spraying has taken its place as a part of the routine work 

 connected with the fruit farm, much attention has been given to the 

 substances used for spraying. The resuhs of many trials with various 

 materials have been published in the bulletins from the difi'erent 

 stations, and now special spray calendars are issued by some stations. 

 Bulletin 1 14 of this Station is a spray calendar. 



Among the standard remedies for chewing insects are Paris green, 

 London purple and hellebore, while the Bordeaux mixture, ammoniacal 

 copper carbonate, liver of sulphur, etc., are recommended for fungous 

 diseases, blights and mildews. 



Paris green is composed of copper, acetic acid and arsenous oxide, 

 and when pure should contain at least 50 per cent, of arsenous oxide. 

 Arsenous oxide is the chemical name for white arsenic. 



Five samples of Paris green recently examined at this laboratory 



contained : 



I = 54.63 per cent, arsenic, 



11 = 54-47 " • 

 111 = 54.32 



IV = 55.32 

 v = 54.90 



London purple is a waste product in the manufacture of some dye 

 stuffs and consists chiefly of arsenic lime and the dye. Paris purple 

 and Enghsh purple are quite similar in character to London purple. 



A sample of English purple gave on analysis : 



Arsenic (As.^Oj ) 36.75 per cent. 



soluble in water 5.36 per cent. 



(( ii 



Paris Purple. Total. Soluble in water. 



No. I. Ars-enic (As.^03) 47-05 11.86 



No. II. " " 34.10 13.88 



The arsenic is here combined with lime. When any of the purples 

 are used as insecticides, two or three times their weight of quick lune 

 should be used to counteract the effect of the arsenic soluble in water. 



