Abstract of a meteorological journal kept at Benares during the Years 1824, 1825, and 1826

The registers, of which the monthly results are presented in a tabular form, contain an account of the states of the barometer, thermometer, the air hygrometer, the wet bulb hygrometer, the degrees of aqueous tension, amount of evaporation, quantity of rain, wind, and other circumstances relating to the weather at Benares during three successive years. The author states it as his opinion, that the diurnal oscillations of the barometer, as well as the monthly variations, are dependent on the alterations of the specific gravity of the air from changes in its temperature; the operations of which may be traced with much greater distinctness at Benares than in the more variable climates of Europe. He illustrates his position by graphic representations of the changes in the barometer, corresponding with those of the thermometer. He next points out a method of reducing the indications derived from hygrometers of different constructions, to absolute degrees of aqueous tension: and concludes, by expressing a hope that the cultivators of hygrometrical science in Europe would take pains to furnish standard instruments of comparison at the several principal stations on the Indian continent; as such a measure is the only security which can be obtained against inaccuracy in the observations that are now very extensively carried on in that part of the world.