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are the poisons formed by plants and are the waste products
of these plants which we use as medicines. An alkaloid is
one of these products which will form a salt with an acid.
There are many of these products, however, that are not alka-
loids, that will not form salts with an acid, yet they may be
poisons. Many of these waste products are not poisonous to
man; so that we have some plants that are poisonous and
many plants that are not poisonous.
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