THE British Science Guild has carried out successfully a very useful enterprise in the British Scientific Products Exhibition, which was opened by Lord Sydenham, president of the Guild, on August 14, at King's College; London. The exhibition contains many examples of products and appliances of scientific and industrial interest which, prior to the war, were obtained chiefly from enemy countries, but which are now produced in the United Kingdom. It is an impressive reminder to all of the great advance made in the production of articles of prime importance for the home and foreign markets hitherto obtained from other countries. The exhibits cover a wide range, and include chemical products and processes, physical and electrical appliances, optical apparatus, measuring and mechanical instruments, surgical, bacteriological, and pathological appliances, including X-ray apparatus, etc. In practically all the sections the degree of progress indicated by the exhibits is surprisingly great, and £ven where no striking development has occurred in the way of new invention, there is noticeable a marked general improvement in apparatus constructed on the recognised lines of pre-war days.