Volume 68 (1778)

W. Watson, H. Cavendish, Amherst, W. Henly, Benjamin Wilson, J. Planta, Chas. Cocks, Joseph Priestley, John Pringle, Ty. Lane, Mahon, John Boddington, Edward Nickson, Edwd. Nairne, S. Horsley, Charles Frederick (93 pages)

On the Arithmetic of Impossible Quantities. By the Rev. John Playfair, A. M. Communicated by the Rev. Nevil Maskelyne, D. D. F. R. S. and Astronomer Royal

John Playfair, Nevil Maskelyne (28 pages)

Reflections on the Communication of Motion by Impact and Gravity. By the Rev. Isaac Milner, M. A. Fellow of Queen's College, Cambridge. Communicated by Anthony Shepherd, D. D. F. R. S. and Plumian Professor at Cambridge

Isaac Milner, Anthony Shepherd (37 pages)

Observations on the Limits of Algebraical Equations; And a General Demonstration of Des Cartes's Rule for Finding Their Number of Affirmative and Negative Roots. By the Rev. Isaac Milner, M. A. Fellow of Queen's College, Cambridge. Communicated by Anthony Shepherd, D. D. F. R. S. and Plumian Professor at Cambridge

Isaac Milner, Anthony Shepherd (10 pages)

Journal of a Voyage to the East Indies, in the Ship Grenville, Captain Burnet Abercrombie, in the Year 1775. By Alexander Dalrymple, Esq. F. R. S. Communicated by the Honourable Henry Cavendish, F. R. S.

Alexander Dalrymple, John Alexander Panton, Burnet Abercrombie, Henry Cavendish (89 pages)

An Essay on Pyrometry and Areometry, and on Physical Measures in General. By John Andrew de Luc, F. R. S.

John Andrew De Luc (137 pages)

Abtract of a Register of the Barometer, Thermometer, and Rain, at Lyndon, in Rutland, 1777. By Thomas Barker, Esquire. Communicated by Sir John Pringle, Bart. P. R. S.

John Pringle, Thomas Barker (6 pages)

Journal of the Weather at Montreal. By Mr. Barr. Communicated by Richard Saunders, M. D. F. R. S.

Mr. Barr, Richard Saunders (6 pages)

Exract of Meteorological Observations Made at Hawkhill, Near Edinburgh. By John M'Gouan. Communicated by Sir John Pringle, Bart. P. R. S.

John Pringle, John M'Gouan (4 pages)

Extract of a Meteorological Journal for the Year 1777, Kept at Bristol, by Samuel Farr, M. D.

Samuel Farr (5 pages)

Journal of the Quantity of Rain That Fell at Holme, Near Manchester, from 1765 to 1769; And at Barowby, Near Leeds, from 1772 to 1777. By George Lloyd

George Lloyd (3 pages)

Meteorological Journal Kept at the House of The Royal Society, by Order of the President and Council

Anonymous (29 pages)

An Account of the Island of St. Miguel. By Mr. Francis Masson, in a Letter to Mr. William Aiton, Botanical Gardener to His Majesty. Communicated by Joseph Banks, Esq. F. R. S.

Joseph Banks, Francis Masson (11 pages)

An Account of a Remarkable Imperfection of Sight. In a Letter from J. Scott to the Rev. Mr. Whisson, of Trinity College, Cambridge. Communicated by the Rev. Michael Lort, B. D. F. R. S.

J. Scott, Michael Lort (5 pages)

An Account of Baptisms, Marriages, and Burials, during Forty Years, in the Parish of Blandford Forum, Dorset. Communicated by Richard Pulteney, M. D. F. R. S.

Richard Pulteney (8 pages)

Part of a Letter from Matthew Guthrie, M. D. of Petersburgh, to Dr. Priestley, F. R. S. on the Antiseptic Regimen of the Natives of Russia

Matthew Guthrie (16 pages)

Astronomical Observations Made in the Austrian Netherlands in the Years 1773, 1774, and 1775. By Nathaniel Pigott, Esq. F. R. S. Foreign Member of the Academies of Brussels and Caen, and Correspondent of the Royal Academy of Sciences at Paris

Nathaniel Pigott (25 pages)

Observations on the Scurvy. By Charles de Mertans, M. D. Dated Vienna, Jan. 14, 1778

Charles De Mertans (21 pages)

Comparison between Sir George Shuckburgh and Colonel Roy's Rules for the Measurement of Heights with the Barometer; In a Letter to Col. Roy, F. R. S. from Sir George Shuckburgh, Bart. F. R. S.

George Shuckburgh (9 pages)

An Account of the Calculations Made from the Survey and Measures Taken at Schehallien, in Order to Ascertain the Mean Density of the Earth. By Charles Hutton, Esq. F. R. S.

Charles Hutton (108 pages)

An Account of the Blue Shark, Together with a Drawing of the Same. By W. Watson, Jun. M. D. F. R. S.

W. Watson (6 pages)

A Description of the Exocoetus Volitans, or Flying Fish. By Thomas Brown, Surgeon, Near Glasgow. Communicated by Dr. Fothergill, F. R. S.

Dr. Fothergill, Thomas Brown (11 pages)

Reasons for Dissenting from the Report of the Committee Appointed to Consider of Mr. Wilson's Experiments; Including Remarks on Some Experiments Exhibited by Mr. Nairne. By Dr. Musgrave, F. R. S.

Mr. Nairne, Dr. Musgrave, Mr. Wilson (23 pages)

Experiments on Electricity, Being an Attempt to Shew the Advantage of Elevated Pointed Conductors. By Mr. Edward Nairne, F. R. S.

Edward Nairne (48 pages)

On the Use of an Amalgam of Zinc, for the Purpose of Electrical Excitation, &c. By Bryant Higgins, M. D. in a Letter to Richard Brocklesby, M. D. F. R. S.

Bryant Higgins (3 pages)

Chemical Experiments and Observations on Lead Ore. By Richard Watson, D. D. F. R. S. in a Letter to Sir John Pringle, Bart. P. R. S.

Richard Watson (22 pages)

Description of a Most Effectual Method of Securing Buildings against Fire, Invented by Charles Lord Viscount Mahon, F. R. S.

Charles Lord Viscount Mahon (12 pages)

A Method of Finding, by the Help of Sir Isaac Newton's Binomial Theorem, a Near Value of the Very Slowly-Converging Infinite Series <tex-math>$x+\frac{xx}{2}+\frac{x^{3}}{3}+\frac{x^{4}}{4}+\frac{x^{5}}{5}+\&\t ext{c}$</tex-math>. When x is Very Nearly Equal to 1. By Francis Maseres, Esq. F. R. S. Cursitor Baron of the Exchequer

Francis Maseres (8 pages)

A Method of Extending Cardan's Rule for Resolving One Case of a Cubick Equation of This Form, x<sup>3</sup>* -qx=r, to the Other Case of the Same Equation, Which It is Not Naturally Fitted to Solve, and Which is Therefore Often Called the Irreducible Case. By Francis Maseres, Esq. F. R. S. Cursitor Baron of the Exchequer

Francis Maseres (49 pages)

Account of the Advantages of a Newly-Invented Machine Much Varied in Its Effects, and Very Useful for Determining the Perfect Proportion between Different Moveables Acting by Levers and Wheel and Pinion. By Mr. Le Cerf, Watch-Maker at Geneva; Communicated by Lord Viscount Mahon, F. R. S.

<prefix>Mr.</prefix> Le Cerf, <prefix>Lord</prefix> Viscount Mahon (50 pages)

New Experiments upon the Leyden Phial, Respecting the Termination of Conductors. By Benjamin Wilson, Esq. F. R. S.

James Lind., Benjamin Wilson, Tiberius Cavallo (17 pages)

Observations on the Solar Eclipse Which Happened June 24, 1778. By Mr. William Wales, F. R. S. and Master of the Royal Mathematical School in Christ's Hospital

William Wales (7 pages)

An Eclipse of the Sun June 24, 1778, Observed at Leicester. By the Rev. Mr. Ludlam, Vicar of Norton, Near Leicester; Communicated by the Astronomer Royal

Mr. Ludlam, Astronomer Royal (4 pages)

A Ready Way of Lighting a Candle, by a Very Moderate Electrical Spark. By John Ingenhousz, M. D. F. R. S.

John Ingenhousz (6 pages)

Electrical Experiments, to Explain How Far the Phenomena of the Electrophorus May Be Accounted for by Dr. Franklin's Theory of Positive and Negative Electricity; Being the Annual Lecture Instituted by the Will of Henry Baker, Esq. F. R. S. By John Ingenhousz, M. D. F. R. S.

Henry Baker, Dr. Franklin, John Ingenhousz (23 pages)

Observations and Experiments Tending to Confirm Dr. Ingenhousz's Theory of the Electrophorus; And to Shew the Impermeability of Glass to Electric Fluid. By William Henly, F. R. S.

William Henly (8 pages)

Track of His Majesty's Armed Brig Lion, from England to Davis's Streights and Labradore, with Observations for Determining the Longitude by Sun and Moon and Error of Common Reckoning; Also the Variation of the Compass and Dip of the Needle, as Observed during the Said Voyage in 1776. By Lieutenant Richard Pickersgill, Late Commander of the Said Vessel; Communicated by Nevil Maskelyne, D. D. F. R. S. and Astronomer Royal

Richard Pickersgill, Nevil Maskelyne (17 pages)

Errata

Anonymous (2 pages)

Back Matter

Anonymous (39 pages)

Articles