68 
16. Whale-Oil Soap.— Dissolve i lb. of soap in one to two 
gallons of warm water. 
17. Rosin and Whale-Oil Soap Compound. - Mix 1 gallon ot 
water with 3 lbs. of powdered washing soda and 4 lbs. of 
powdered rosin. Boil til! dissolved and, while boiling, 
make up slowly to 5 gallons. 
In a separate vessel boil 10 lbs. of whale oil soap with 5 
gallons of water. These may be mixed while hot to make 
the stock solution or, when cold, mix these two with 35 
gallons of cold water, pouring both into the. water together 
while active!)' stirring the mixture. However mixed, the 
final amount must he 45 gallons. 
18. Tobacco and Soap. — Dissolve 1 quart of solt soap, or 
i lb. of hard soap in 5 gallons of water, and add 2 quarts of 
strong tobacco decoction (No. II.) 
Use of The Poisons 
The poisons enumerated above are to be applied as follows 
Those in list A are suitable for application to plants that are eaten 
by caterpillars (worms) and other biting insects. 1 he arsenical 
poisons, such as London Purple or Paris Green, are of universal 
application against caterpillars and other pests that destroy foli- 
age, but it must be remembered that arsenic is poisonous to man 
and does not quickly get entirely washed off by rain. Hellebore, on 
the other hand, very soon loses its poisonous properties and be- 
comes harmless after some exposure to air. Pyrethrum is harmless 
to higher animals, but has a powerful influence on insects. It may 
be applied without danger of poisoning human beings or cattle. 
Tobacco has a special value in a few cases only, and has less clami 
to be regarded as a general insecticide. 1 hose in list B are the 
contact-poisons for application to plants infested with mealy-bug, 
scale insects, etc. 
When using large quantities of these insecticides, the question 
of relative cost becomes important. 
The prices of the materials mentioned in list A are subjoined, 
as quoted in New York : 
Paris Green - 
London Purple 
Hellebore 
Pyrethrum 
In Barbados (Messrs. C. F. Harrison & Co.) 
be obtained: — • 
Paris Green - 54 cents per lb. 
London Purple - 30 cents per lb. 
Refuse Tobacco 4 cents per lb. 
25 cents per lb. 
6— r 5 cents per lb. 
20 cents per lb. 
35 cents per lb. 
the following may 
The cost of Washes in list B, has been calculated, per 100 gallons 
of wash ready for application, exclusive of fuel and labour. These 
fio-ures are approximate and represent, as closely as possible, firstly, 
the cost of the materials in large quantities in Barbados, free of 
dutv, and secondly, the cost at retail prices as quoted in Barbados. 
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