The volume, edited by Dr. J. Rambottom, features contributions from various botanists and is praised for its illustrations, making it a valuable addition to botanical libraries despite its high price. The "Actualités Scientifiques et Industrielles" series by Messrs. Hermann includes two parts on the biological effects of ultra-sound waves, authored by Prof. N. Marinesco. The first part covers the electro-elastic properties of quartz and the production of stationary waves, while the second part discusses the sterilization of water and milk, emulsion production, explosive detonation, and chemical reactions. The Third International Cancer Congress, organized by the International Union against Cancer, will be held in Atlantic City, New Jersey, from September 11-16, 1939. The congress will cover various topics including general research, biophysics, genetics, pathology, surgery, radiological diagnosis, radiotherapy, statistics, and education. The Le Play Society's "Discovery" chart has been revised and published as a pocket-book titled "Exploration," with blank leaves for maps and notes. It encourages local exploration and scientific curiosity, suitable for scoutmasters, girl-guides, and educators in local history, geography, and civics. Recent appointments and promotions in the Colonial Service include positions such as field geologist, inspector of mines, agricultural officer, entomologist, meteorological assistant, and more, across various colonies and territories. A significant shower of fireballs was observed in southern Sweden on May 27, 1939, with two particularly bright fireballs visible in full sunshine over Bornholm Island. Further details are requested by A. Corlin.The volume, edited by Dr. J. Rambottom, features contributions from various botanists and is praised for its illustrations, making it a valuable addition to botanical libraries despite its high price. The "Actualités Scientifiques et Industrielles" series by Messrs. Hermann includes two parts on the biological effects of ultra-sound waves, authored by Prof. N. Marinesco. The first part covers the electro-elastic properties of quartz and the production of stationary waves, while the second part discusses the sterilization of water and milk, emulsion production, explosive detonation, and chemical reactions. The Third International Cancer Congress, organized by the International Union against Cancer, will be held in Atlantic City, New Jersey, from September 11-16, 1939. The congress will cover various topics including general research, biophysics, genetics, pathology, surgery, radiological diagnosis, radiotherapy, statistics, and education. The Le Play Society's "Discovery" chart has been revised and published as a pocket-book titled "Exploration," with blank leaves for maps and notes. It encourages local exploration and scientific curiosity, suitable for scoutmasters, girl-guides, and educators in local history, geography, and civics. Recent appointments and promotions in the Colonial Service include positions such as field geologist, inspector of mines, agricultural officer, entomologist, meteorological assistant, and more, across various colonies and territories. A significant shower of fireballs was observed in southern Sweden on May 27, 1939, with two particularly bright fireballs visible in full sunshine over Bornholm Island. Further details are requested by A. Corlin.