THE opening of the new Museum of Practical Geology, South Kensington, London, S.W.7, and the celebrations of the centenary of the Geological Survey of Great Britain, will take place on July 3-4. The opening ceremony will be performed by H.R.H. the Duke of York on July 3 at 3 p.m. A preliminary account of the proceedings appeared in NATURE of March 23, p. 463. In the final programme now issued, it is announced that the director of the Geological Survey, Sir John Flett, will deliver an address on July 4 on the history and functions of the Museum, in the lecture hall of the Victoria and Albert Museum. Several geological excursions have been arranged to follow the celebrations, and delegates will have the opportunity of studying, under expert guidance, the Isle of Wight and mainland opposite, the Wealden district, South Wales and Bristol, or Edinburgh and surrounding country. Further information can be obtained from the Director, Geological Survey of Great Britain, Museum of Practical Geology, South Kensington, London, S.W.7.