CHAPTER NIV 
Porson Insecticipes — For Bitrne Insects 
Paris Green 
Paris green , , F : . 5 ounces 
Lump lime F : : : , . 1 pound 
Water. : : ; F : . 50 gallons 
For small quantities use: 
Paris green. : : . : . lLheaping teaspoonful 
Lump lime ; ; : : F . 2 or 3 ounces 
Water. : ’ : ; as . 3 gallons 
Paris green is a bright green, heavy, finely divided powder, and is 
one of the compounds of arsenic. It may be applied dry, but is much 
better used in water or other liquid as a spray. It is a violent poison. 
The present standard calls for at least 50 per cent arsenious oxid, and 
not over 33 per cent soluble arsenic. 
If applied dry, mix with three or four times the same weight of flour 
or fine, air-slaked lime, preferably the latter. Dust lightly on the 
plants. Be careful not to put on too much, or there will be danger of 
burning the foliage because of the “free "’ or soluble arsenic apt to be 
found in the material. A good way is to mix the poison and the lime 
together, thoroughly, place in a muslin bag and shake gently over the 
plants. If this is done when the dew is on, or just after a shower, the 
material will stick better to the foliage. 
If to be used as a spray, Paris green may be mixed with water or with 
Bordeaux mixture. In either case, the amount to use is from 4 to 5 
ounces of the Paris green to 50 gallons of the liquid. If water 
is used, add about 1 pound of fresh lump lime to each 50 gal- 
lons of water. This is done to neutralize any soluble arsenic present 
and thus avoid injuring the foliage. 
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