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Orchid Fertilization.

THE VARIOUS CONTRIVANCES BY WHICH ORCHIDS are Fertilized by Insects. By Charles Darwin. Second edition revised. With illustrations. New York: D. Appleton & Co.; San Francisco: Payot, Upham & Co. 1877. 12mo.; pp. 300.

The first edition was published in 1862, and in the meantime many books and papers bearing on the subject have been published, and much new information acquired, thus furnishing additional material which the author has incorporated in his work, making it almost a new book. Although the subject is not directly connected with the theory known as the Darwinian, it occasionally suggests remarks about natural selection; and the essay will be read with interest by botanists and admirers of Darwin.