The volume is edited by Dr. J. Ramsbottom and is well-received by both editor and contributors. Although the price seems high, the illustrations alone make it a good value and a valuable addition to any botanical library. A section of Messrs. Hermann's "Actualités Scientifiques et Industrielles" series is devoted to the effects of radiation on living organisms, under the charge of Prof. N. Marinesco. Two parts on ultra-sound waves have been published. The first describes the electro-elastic properties of quartz, stationary waves in liquids, and radiation intensity. The second discusses the effects of ultra-sound waves in sterilizing water and milk, producing emulsions, detonating explosives, and accelerating chemical reactions, particularly in photography. The book includes many photographs and bibliographies. The Third International Cancer Congress will be held in Atlantic City, New Jersey, on September 11–16, 1939. The congress will cover various topics including general research, biophysics, genetics, and radiotherapy. Details on section chairmen and committees will be announced later. The Le Play Society has revised and published its "Discovery" chart in pocket-book form as "Exploration," with blank leaves for maps and notes. It covers various fields of local exploration and aims to stimulate curiosity and appreciation for local history and geography. Recent appointments and promotions have been made in the Colonial Service, including positions in various territories. A remarkable shower of fireballs was reported in southern Sweden on May 27, with two bright fireballs visible over Bornholm Island. Further details are requested by A. Corlin.The volume is edited by Dr. J. Ramsbottom and is well-received by both editor and contributors. Although the price seems high, the illustrations alone make it a good value and a valuable addition to any botanical library. A section of Messrs. Hermann's "Actualités Scientifiques et Industrielles" series is devoted to the effects of radiation on living organisms, under the charge of Prof. N. Marinesco. Two parts on ultra-sound waves have been published. The first describes the electro-elastic properties of quartz, stationary waves in liquids, and radiation intensity. The second discusses the effects of ultra-sound waves in sterilizing water and milk, producing emulsions, detonating explosives, and accelerating chemical reactions, particularly in photography. The book includes many photographs and bibliographies. The Third International Cancer Congress will be held in Atlantic City, New Jersey, on September 11–16, 1939. The congress will cover various topics including general research, biophysics, genetics, and radiotherapy. Details on section chairmen and committees will be announced later. The Le Play Society has revised and published its "Discovery" chart in pocket-book form as "Exploration," with blank leaves for maps and notes. It covers various fields of local exploration and aims to stimulate curiosity and appreciation for local history and geography. Recent appointments and promotions have been made in the Colonial Service, including positions in various territories. A remarkable shower of fireballs was reported in southern Sweden on May 27, with two bright fireballs visible over Bornholm Island. Further details are requested by A. Corlin.