The London Encyclopaedia Or Universal Dictionary of Science Art Literature a
The London Encyclopaedia Or Universal Dictionary of Science Art Literature a
Charles Shirra Dougall
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It has been observed that this principle is more abundant in old than in young plants. There are doubtless various species of extractive, which differ according to the plants from which they are derived. But these differences have not yet been sufficiently ascertained. Beside ulmin, the bitter principle, asparagin, inulin, and other principles, to which we elsewhere refer, some modern writers include the following under the head of extractive matter. Dr. Bostock how- ever, and others, have doub...ted whether after all there be any distinct principle to which the name of extinct or extractive can be legitimately 488 CHEMISTRY. mushroom. NARCOTIC PRINCIPLE, AND RECENTLY DISCOVERED VEGETABLE PRINCIPLES, CHIEFLY OF AN ALKA- LINE NATflRE. applied. The substances to which we allude are bulky coal is left, which contains some potassa. Hematin from logwood ; polychroite from saf- It is soluble in all the acids, from which it is fron; picrotoxin from cocculus Indicus ; nice- precipitated by the alkalis, tin from tobacco; emetin from ipecacuanha; 1319.
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