IX. Abstract of Observations on a diurnal Variation of the Barometer between the Tropics. By J. Horsburgh, Esq. In a Letter to Henry Cavendish, Esq. F.R.S.
X. Concerning the Differences in the magnetic Needle, on Board the Investigator, arising from an Alteration in the Direction of the Ship's Head. By Matthew Flinders, Esq. Commander of his Majesty's Ship Investigator. In a Letter to the Right Hon. Sir Joseph Banks, K.B. P.R.S.
XI. The Physiology of the Stapes, one of the Bones of the Organ of Hearing; deduced from a comparative View of its Structure, and Uses, in different Animals. By Anthony Carlisle, Esq. F.R.S.
XII. On an artificial Substance which possesses the principal characteristic Properties of Tannin. By Charles Hatchett, Esq. F.R.S.
XIII. The Case of a full grown Woman in whom the Ovaria were deficient. By Mr. Charles Pears, F.L.S. Communicated by the Right Hon. Sir Joseph Banks, K.B. P.R.S.
XIV. A Description of Malformation in the Heart of an Infant. By Mr. Hugh Chudleigh Standert. Communicated by Anthony Carlisle, Esq. F.R.S.
XV. On a Method of analyzing Stones containing fixed Alkali, by Means of the Boracic Acid. By Humphry Davy, Esq. F.R.S. Professor of Chemistry in the Royal Institution