A

JOURNAL

OF

NATURAL PHILOSOPHY,

CHEMISTRY,

AND

THE ART S.

VOL. IX.

Illustrated with Engravings.

BY WILLIAM NICHOLSON.

LONDON:

PRINTED BY W. STRATFORD, CROWN COURT, TEMPLE BAR; FOR

THE AUTHOR,

AND SOLD BY HIM AT NO. 10, SOHO-SQUARE;

AND BY

J. MURRAY, No. 32, FLEET-STREET.

THE Authors of Original Papers in the present Volume,

are Mr. John Gough; Rev. Jonathan Wilson; E. O.; Mr. Wilson; Amicus; Mr. G. B. Greenough; Hon. Robert Clifford; A. A.; Mr. William Irvine; James Thompson, M. D.; Mr. J. Dalton; J. P.; Sir Henry C. Englefield, Bart. F. R. S.; Thomas Young, M. D. F. R. S.; Mr. John Antis; Ra. Thicknesse, Esq.; R. B; H. G.; Mr. William Henry; James Malton, Esq.; Mr. A. G. Theolden; Mr. W. Boswell; Alexander Marcet, M. D.; Mr. Timothy Sheldrake; Mr. Ezekiel Walker; C. Wilkinson, Esq.; Mr. Charles Sylvester; A Correspondent; Mr. Edward Troughton; W. Jessop, Esq.; C. L.; Thomas Harrison, Esq.

Of Foreign Works, H. Beaupoil; Count Apollos de Moussin Poushkin; Abbe Buée; Abbe Hauy; Romé de L'Isle; M. Maunoir; Huber; Professor Veau-de-Launay; Cit. Curadau; Michael de Grubbens; Professor Prevost; M. Seguin; M. Vauquelin; C. L. Morozzo; M. Parmentier ; B. G. Sage; R. Prony; Bucholz; J. H. Hassenfratz; W. D'Hesinger and J. B. Berglius; Bode; Professor Proust ; Tromsdorff; Strauss.

And of English Memoirs, abridged or extracted; Charles Hatchett, Esq. F. R. S.; Benjamin Count of Rumford, V. P. R. S. &c.; Thomas Young, M. D. F. R. S.; Mr. John Prior; Sir James Hall, Bart.; Mr. W. Bowler; Mr. Thomas Willis.

Of the Engravings the Subjects are, 1. Two Plates of Apparatus for Experiments on Heat; by Count Rumford. 2.

A new