In the Meteorological Tables for England, published at the public expense, viz., those of Greenwich Observatory, and those of the fifty-five meteorological stations in England, appended to the Registrar-General's Quarterly Reports, the mean temperature as given is not the true mean, but is an estimated mean, deduced from the united observations made with the self-registering and dry-bulb thermometers, the exact means of these instruments being first altered by certain tables, with the view of correcting them for diurnal and monthly range. The author objected to this mode of estimating the mean temperature, because the tables used for the purpose of correction were drawn up from insufficient data, and because the principle was bad of having observations made by one instrument, whose readings were liable to constant errors, made the basis for the correction of observations made by a more trustworthy instrument.