SINCE the change to Japanese control of the tin-producing regions in south-eastern Asia, the sources of about two-thirds of their supplies have been lost to the Allies. In an attempt to make this good, the Ministry of Supply has just issued a pamphlet on modifications recommended in bearing-metal practice. More than 2,000 tons of tin are used annually in Great Britain in bearing-metals, and the new suggestions, if loyally adopted, would, it is estimated, ensure a saving of 65 per cent, equal to the entire output of the Cornish mines last year. This pamphlet is available from the Non-Ferrous Metals Control, Grand Hotel, Rugby, or the Tin Research Institute, Fraser Road, Greenford, Middlesex. The white bearing-metals have been divided into four groups with 80-92, 68-75, 7-12 and 0-5 per cent of tin respectively. Alloys with 12-68 per cent of tin have very rightly been omitted entirely, as suitable alloys for practically any purpose can be found in the compositions still retained, modified, if necessary, by other additions. A long list of typical bearings is given with the class of alloy suitable for each. Alloys falling outside these groups may be used only with the approval of the Non-Ferrous Metals Control.