The second volume of this very useful work is before us, completing the whole Botany of the State. Californians have especial reason to be thankful; for their legislature gave no assistance, and private enterprise supplied the funds, which the State ought to have advanced. It seems strange to have part of a "geological survey of a State" supplied by private means. The present volume is the work of Mr. Sereno Watson, except special chapters furnished by Engelmann, Eaton and others. It will be an enduring monument to Mr. Watson's industry and scientific eminence.