WE welcome the appearance, after a decade, of a V V second edition of this well-known handbook. Considerable advances have been made in that period as regards our knowledge of the principles of forest entomology. The European pine sawfly, for example, has become prominent as a forest pest in that short period. Certain chapters of the book have been almost wholly rewritten: others have been revised, and the bibliography has been brought up to date.

    Principles of Forest Entomology

    By Prof. Samuel Alexander Graham. (McGraw-Hill Publications in the Zoological Sciences.) Second edition. Pp. xvi + 410. (New York and London: McGraw-Hill Book Co., Inc., 1939.) 24s.

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    Forestry. Nature 145, 496 (1940).

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