CONTENTS. 
XII. Observations of a second Comet, with Remarks on its 
Construction. By William Herschel, LL. D. F. R,S. p. 229 
XIII. Additional Experiments on the Muriatic and Oxymuriatic 
Acids. By William Henry, M. D. F. R. S. V. P. of the Lit. 
and Phil. Society, and Physician to the Infirmary, at Man- 
chester. p. 238 
XIV. Of the Attraction of such Solids as are terminated by Planes; 
and of Solids of greatest Attraction. By Thomas Knight, Esq. 
Communicated by Sir Humphry Davy, Knt. LL.D. Sec . R. S. 
p. 247 
XV. Of the Penetration of a Hemisphere by an indefinite Number 
of equal and similar Cylinders. By Thomas Knight, Esq. 
Communicated by Sir Humphry Davy, Knt. LL. D. Sec. R. S. 
p. 310 
XVI. On the Motions of the Tendrils of Plants. By Thomas 
Andrew Knight, Esq. F. R. S. In a Letter to the Right Hon . 
Sir Joseph Banks, Bart. K. B. P. R. S. p. 314 
XVII. Observations on the Measurement of three Degrees of the 
Meridian conducted in England by Lieut. Col. William Mudge. 
By Don Joseph Rodriguez. Communicated by Joseph de 
Mendoza Rios, Esq. F. R. S. p. 321 
XVIII. An Account of some Experiments on different Combina- 
tions of Fluoric Acid. By John Davy, Esq. Communicated 
by Sir Humphry Davy, Knt. LL.D. Sec. R. S. p. 352 
