THE Royal Observatory at Uccle has just celebrated its first centenary by a number of official functions. At the opening ceremony, which was graced by the presence of His Majesty the King of Belgium, addresses were read on the history of the Observatory by the director, M. Paul Stroobant, and on Adolphe Quetelet the founder of the Observatory by M. Demoulin, president of the Observatory Council. Receptions were given at the Hotel de Ville by Burgomaster Max and at the Fondation Univer-sitaire. But the event of chief scientific interest was the visit to the Observatory itself, when the Minister of Education inaugurated a number of new instruments obtained with the aid of a generous Government grant. Amongst these mention must be made of an Askania meridian circle, a Zeiss double astro-graph, a 1-metre Zeiss reflector and a number of auxiliary pieces of apparatus. The meridian circle is provided with a number of electrical devices and gives a photographic record of the reading circles for each observation; it can be reversed in 30 seconds. The Zeiss double astrograph is of focal length 2m., working at //5; the object glasses are quadruplets designed by Sonnefeld. The Zeiss reflector works at //3 at the Newtonian focus for direct photography, but it is hoped later to add a Ross correcting lens. A 2-prism spectrograph is provided for use with the telescope as a Cassegrain reflector at//10. The whole of the recently acquired equipment, on which the Observatory and its director are to be congratulated, is described in full detail in the Bull. ast. de VObs. roy. de Belgique, 2, 1935. The British delegates attending the centenary were Dr. L. J. Comrie, director of the Nautical Almanac, Mr. J. H. Reynolds, president of the Royal Astronomical Society, and Prof. F. J. M. Stratton, general secretary of the International Astronomical Union.