Summary: CERTAIN kinds of British optical and scientific instruments are subject to special quotas when imported into France. In order to ensure the full benefit of these quotas to British manufacturers, and to prevent the detention of shipments, the French Government has authorised the Scientific Instrument Manufacturers Association of Great Britain to issue certificates to shippers. The instruments to which these certificates apply are as follows:simple surveying instruments; dividing machines; house barometers; apparatus for physical and chemical demonstration for schools and colleges; apparatus for physical and chemical researches and analyses; surveying instruments for geodesy, topography and measurements of angle. More precise information may be obtained from the Secretary, Scientific Instrument Manufacturers Association of Great Britain, Limited, 329 High Holborn, London, W.C.1.