Читать книгу The Seven Sisters of Sleep. Popular History of the Seven Prevailing Narcotics of the World онлайн

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Opinions vary as to the origin of amber. Tacitus and others have considered it a fossil resin exhaled by certain coniferous trees, traces of which are frequently observed among the amber, whilst other theorists contend that it is a species of wax or fat, having undergone a slow process of putrefaction; this latter view being based upon the fact that chemists are able to convert fatty or cerous substances into succinic acid by artificial oxidation. One thing is, however, certain, that amber, at some period of its history, must have existed in a state of fluidity, since numerous insects, especially of the spider kind, are found imbedded in it; and a specimen has been shown enclosing the leg of a toad. Toads are in the habit of living for centuries, we are informed, cooped up in stone and rock; but we are not aware that hitherto any of these extraordinary reptiles have been found buried alive in a mass of amber. Masses of amber have been found weighing from 4 lbs. to 6 lbs.—more than large enough to contain a toad or two of ordinary dimensions.