THE first impression one receives at the exhibition arranged by Messrs. Johnson, Matthey & Co., Ltd., at Dorland Hall, Lower Regent Street, London (June 13-26, admission by ticket from the Company, 73-83 Hatton Garden, London, E. C. I), is the extremely wide range of application of the products of this company and its associates. Besides the production of gold, silver, platinum and similar metals in pure form, there are numerous specialized products, from well-known laboratory ware, thermocouples and chemical plant to electrical contacts, catalysts, electrical measuring instruments, electronic equipment, brazing alloys, ceramic colours and alloys for manufacturing jewellers and dentists, to mention only a few. The less well-known ceramic side of Johnson, Matthey and Co.'s interests is well represented by a display of pottery, china and glassware illustrating the extensive range of brilliant coloured enamels and lustres available, as well as the use of platinum and gold. The jewellery section does not exhibit finished jewellery so much as the special rolled gold wire, gold and silver alloys in various special forms for the manufacturing jeweller, platinum and palladium in jewellery form and special salts and anodes for plating with these metals. The dental, surgical and optical division displays a range of dental gold alloys in wire, castings and inlay form, radium equipment for medical use and a variety of rolled gold shapes for the spectacle manufacturer.