Volume 71 of the Philosophical Transactions of the Royal Society of London, 1781, Part 124, contains fifteen papers. Three are highlighted: one on the specific gravities and attractive powers of various salts by Richard Kirwan, another on a lightning storm in Eastbourne, and a third on the Harmattan, a singular African wind by Matthew Dobson. Kirwan's work builds on the research of Bergman and Wenzel, and he determines the proportions of ingredients in many salts and the specific gravity of mineral acids. The lightning storm in Eastbourne caused severe injuries to James Adair, including burns and torn clothing. The Harmattan is a periodic wind from Africa that brings dryness, fog, and heat, causing damage to vegetation and human bodies. It is noted for its ability to stop the spread of diseases and aid in healing. The paper also discusses the origin of the Harmattan, differing from Dr. Lind's view. Other papers include descriptions of the Tyger Cat, a new screw method, the Turkey, a nebula, double stars, the Ganges and Burrampooter rivers, planetary rotation, termites, earthquakes in Wales, and meteorological observations. The volume also includes a list of the Society's members and a speech by the president.Volume 71 of the Philosophical Transactions of the Royal Society of London, 1781, Part 124, contains fifteen papers. Three are highlighted: one on the specific gravities and attractive powers of various salts by Richard Kirwan, another on a lightning storm in Eastbourne, and a third on the Harmattan, a singular African wind by Matthew Dobson. Kirwan's work builds on the research of Bergman and Wenzel, and he determines the proportions of ingredients in many salts and the specific gravity of mineral acids. The lightning storm in Eastbourne caused severe injuries to James Adair, including burns and torn clothing. The Harmattan is a periodic wind from Africa that brings dryness, fog, and heat, causing damage to vegetation and human bodies. It is noted for its ability to stop the spread of diseases and aid in healing. The paper also discusses the origin of the Harmattan, differing from Dr. Lind's view. Other papers include descriptions of the Tyger Cat, a new screw method, the Turkey, a nebula, double stars, the Ganges and Burrampooter rivers, planetary rotation, termites, earthquakes in Wales, and meteorological observations. The volume also includes a list of the Society's members and a speech by the president.