SALTS, effects of in producing great degrees of cold. In the account of the remarkable effects of frigorific mixtures, in which saline bodies act so important a part, given in our article CHEMISTRY, some errors had crept in. These errors through the liberal attention of Mr Walker of Oxford, whose researches on this subject have been carried farther than any other chemist, we are enabled to correct by laying before our readers the following tables, most obligingly communicated to us by that gentleman.