Travels on the Amazon and Rio Negro...

Abstract

V delightfulMalay Archipelago/' first published in 1869, cannot know all the treasures given to science by Mr. Wallace's eight years' expatriation, for before writing his travels he had con- tributed no fewer than eighteen papers to the transactions or journals of the Linnean, Zoological, and Entomological Societies, and twelve articles to various scientific periodicals, while in his subsequent volumes on '^Natural Selection," 187 1, his monumental work on the "Geographical Distribution of Animals," 1876, on "Tropical Nature," 1878, and on "Island Life," 1880, he laid open still more fully his accumulations of travel and thought in both hemispheres.One of the most valuable results of his travels in Malaysia was the establishment of a line dividing the archipelago into two main groups, Indo-Malaysia and Austro-Malaysia, marked by peculiar species and groups of animals.This line, now everywhere known as Wallace's line, is marked by a deep sea belt between Celebes and Borneo, and Lombok and Bali respectively ; and it is curious that a similar line, but somewhat further east, divides on the whole the Malay from in the same year lie wrote to Mr. Wallace, "I infinitely admire and honour your zeal and courage in the good cause of Natural Science."In February 1858 Mr. Wallace wrote an essay at Ternate, " On the Tendency of Varieties to depart indefinitely from the original Type," which proved

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