THIS book is the outcome of the residence of a specialist for nearly a year upon a small island off the extreme north point of Celebes. Of books of travel there is in these days no lack, and so beaten are the paths along which authors for the most part lead us, that the reader in search of amusement or instruction not infrequently arrives at the index without having met with either. But Dr. Hickson's is not a book of travel: it is a record of a naturalist's life with an almost boundless submarine field for observation close at hand—albeit terrestrially somewhat limited—and when he leaves his coral-girt island, it is to wander in that little-known archipelago which links Celebes to the Philippines, the Sangir, Nanusa, and Talaut groups, whither few but adventurous Dutchmen have penetrated. A Naturalist in North Celebes. By Sydney J. Hickson. With Maps and Illustrations. Pp. 392. (London: John Murray, 1889.)