Abstract
IN NATURE for December 20, 1883, Dr. James Macaulay has collected (pp. 176, 177) some recorded instances of the wide distribution at former periods of volcanic dust. Perhaps the following may be worth adding. It is to be found in that extraordinary repertory of curious information and suggestion, the “Philosophical Notes” to Darwin's “Botanic Garden” (part ii. 3rd edition, 1791, p. 167).
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