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When Mr. Lubbock undertook, last year, an examination of the Meteorological Observations made daily at the Royal Society, during the preceding four years, he found that no satisfactory result connected with the diurnal variation of the barometer could be obtained from them, in consequence of the stated hours of observation not recurring after sufficiently small intervals of time. From the interesting nature of the phenomena of the barometer, and from the circumstance of no observations for determining the amount and peculiarities of its horary oscillation having been made at the Royal Society, I proposed to undertake as extensive a series of hourly observations on this instrument as my official duties and the state of my health would permit;—to prosecute such experimental investigations into collateral branches of the inquiry, as the anomalies presenting themselves might require;—and to insti­tute, finally, a comparison between my own results and those derived from the labours of other observers, both in this country and on the Continent. In endeavouring to accomplish these objects, I have been anxious in the first instance to present to the Society a series of observations, made at equal intervals of time,—in sufficient number,—through an extended pe­riod,—and with instruments, whose peculiarities of excellence or defect are well known and understood; and which, being conducted with every care, may furnish preliminary data for explaining the anomalies of its hourly and daily oscillation; determining, if possible, the laws which regulate its perio­dical changes; and ascertaining the circumstances which accelerate or retard the operation of these laws: being guided, in the progress of the inquiries, by the strict inductive intimations only of the results themselves, and with­out reference to any particular theory or current hypothesis.

XXIV. Hourly observations on the barometer; with experimental investigations into the phenomena of its periodical oscillation