The Malay Archipelago - Overview

Overview

The preface summarizes Wallace’s travels, the thousands of specimens he collected, and some of the results from their analysis after his return to England. In the preface he notes that he travelled over 14,000 miles and collected 125,660 specimens, mostly of insects: 83,200 beetles, 13,100 butterflies and moths, 13,400 other insects. He also returned to England 7,500 "shells" (such as molluscs), 8,050 birds, 310 mammals and 100 reptiles.

The book is dedicated to Charles Darwin, but as Wallace explains in the preface, he has chosen to avoid discussing the evolutionary implications of his discoveries. Instead he confines himself to the "interesting facts of the problem, whose solution is to be found in the principles developed by Mr. Darwin", so from a scientific point of view, the book is largely a descriptive natural history. This modesty belies the fact that while in Sarawak in 1855 Wallace wrote the paper On the Law which has Regulated the Introduction of New Species, concluding with the evolutionary "Sarawak Law", "Every species has come into existence coincident both in space and time with a closely allied species", three years before he fatefully wrote to Darwin proposing the concept of natural selection.

The first chapter describes the physical geography and geology of the islands with particular attention to the role of volcanoes and earthquakes. It also discusses the overall pattern of the flora and fauna including the fact that the islands can be divided, by what would eventually become known as the Wallace line, into two parts, those whose animals are more closely related to those of Asia and those whose fauna is closer to that of Australia.

The following chapters describe in detail the places Wallace visited. Wallace includes numerous observations on the people, their languages, ways of living, and social organization, as well as on the plants and animals found in each location. He talks about the biogeographic patterns he observes and their implications for natural history, in terms both of the movement of species and of the geologic history of the region. He also narrates some of his personal experiences during his travels. The final chapter is an overview of the ethnic, linguistic, and cultural divisions among the people who live in the region and speculation about what such divisions might indicate about their history.