[ V ] 
CONTENTS 
T Q 
V O L. LXVII. Part II. 
XX. Account of a Volcanic Hill near Invernefs. 
In a Letter from Thomas Weft, Efq. to Mr. 
Lane, F, R. S. P a g e 385. 
XXI. New Elehlrical Experiments and. Obfervations ; with 
an Improvement of Mr. Canton’s FleBrometer. By 
Mr. Tiberius Cavallo, in a Letter to Mr. Henly, 
F. R. S. p. 388 
XXII. Barometrical Obfervations on the Depth of the Mines 
in the- Hartz. By John Andrew de Lue, F. R. S. In 
a Letter to Sir John Pringle, P. R. S. p. 401 
XXIII. Fhe general Mathematical Laws which regulate 
and extend Proportion univerfally ; or, a Method of 
comparing Magnitudes of any Kind together , in all the 
pojfible Degrees of Increafe and Decreafe. By James 
Glenie, A. M. and Lieutenant in the Royal Regiment of 
Artillery. p. 450- 
XXIV. . 
