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 sily traced. In Italy, Malpighius and Rhedi took several Parts. Rhedi (q) examined very many general Sorts, those Insects especially which are believed to be produced from the Putrefaction of Flesh: Those he found to grow from Eggs laid by other grown Insects of the same Kinds. But he could not trace the Origination of those which are found upon Leaves, Branches, Flowers, and Roots of Trees. The Generation of those was nicely examined by Malpighius, in his curious Discourse of Galls, which is in the 2d. Part of his Anatomy of Plants; wherein he has sufficiently shewn, that those Excrescencies and Swellings which appear in Summer upon the Leaves, tender Twigs, Fruits and Roots of many Trees, Shrubs and Herbs, from whence several sorts of Insects spring, are all caused by Eggs laid there by full grown Insects of their own Kinds; for which Nature has kindly provided that secure Harbour, till they are able to come forth, and take Care of themselves. But Rhedi has gone further yet, and has made many Observations upon Insects that live, and are carried about on the Bodies of other Insects. His Observations have not been weakned by Monsieur Leeuwenhoek, whose Glasses, which are said to excel any ever yet used