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VEGETABLE GARDENING 
are: (i) It is harmless to the foliage, (2) it adheres better 
to the foliage; (3) it remains longer in suspension. The 
usual strength is 3 pounds of lead arsenate to 50 gallons 
of water. Weaker mixtures are often effective, while 5 
pounds to 50 gallons may be an advantage in killing in- 
sects difficult to poison. The commercial preparation 
which comes either in the form of a paste or a powder 
may be mixed thoroughly with a small quantity of water 
before diluting in the sprayer. It may be used with bor- 
deaux mixture without diminishing the value of either. 
130. Paris green, a stomach poison, has been used ex- 
tensively for many years in combating chewing insects. 
In order to prevent injury to foliage, it is always de- 
sirable to add some lime in the preparation of the spray. 
One pound of lime and one pound of paris green are 
used with 75 to 200 gallons of water, depending upon 
the susceptibility of the foliage to burning. It is always 
safer to have a slight excess of lime in the mixture. The 
paris green becomes more thoroughly diffused in the 
water if it is first mixed to a paste. As it is simply held 
in suspension and as it sinks quickly, the spray pump 
should be provided with an agitator to keep the mixture 
constantly stirred while being applied. 
131. Hellebore. — White hellebore finds favor among 
some home gardeners mainly because it soon loses its 
poisonous principle when exposed to the air. As a stom- 
ach poison it is effective for cabbage worms and other 
pests, if the material is fresh when applied. It may be 
used as a powder, but the distribution is more thorough 
if applied as a spray, using ^2 to 2 ounces of powder in 
1 gallon of water. 
132. Kerosene emulsion is probably the most exten- 
sively used of contact poisons for sucking insects. It is 
prepared as follows : Dissolve y 2 pound of hard, soft or 
whale-oil soap in a gallon of hot water; while hot, add 2 
gallons of kerosene. Then use a force pump provided 
