CONTENTS. _m 
cf Wind , and an Experiment to af certain to what 
Quantity of Water a Fall of Snow is equal, p. 224 
XXVII. Some Obfervations on the Country and Mines 
of Spain and Germany, with an Account of the 
Formation of the Emery Stone ; from William 
Bowles, Ef quire , DireBor General of the Mines of 
Spain j communicated by P. Coliinfon, F. R. S.~ 
' p. 229.. 
XXVIII. Comment arius de indole EleBrica Turmalini , 
auBore Torberno Bergman, Mathematum & Phi- 
lo (ophite Naturalis ad Reg. Academiam Upfal. ad- 
junBo , Academics Imper. N. C. Academics Reg. Sci- 
entiarum Stockholmenfis & Societatis Regia Lon- 
dinenfis Membro, p. 236, 
XXIX. Theory of the Parallaxes of Altitude for the 
Sphere , by Mr. F. Mallet, Prof e for and Afrono- 
mer at Upfal ; Tranflated from the French, by M. 
Maty, M. D. R . S. Sec , p. 244,. 
XXX. A Catalogue of the Fifty Plants from Chelfea 
Garden, prefented to the Royal Society by the wor- 
jhipful Company of Apothecaries, for the Tear 1765,. 
purfuant to the DireBion of Sir plans Sloane, Ba- 
ronet , Med. Reg. et See. Reg. imper Prafes by 
William Hudfon, Societatis Regia & Bar if] Socicta- 
t is Pharmaceut. Lond. See. Hart. Chelfean. Free - 
feBus et “P rale Bor Botanic. p. 2 co. 
* XXX. Obfervations on the Eclipfe of the Sun of 
Ayguft 5, 1766, made at Colombes, the Gbfer-va- 
tory of the Marquis cf Courtenvaux, 20W Ea/l of 
the Royal Obfervatory at Paris, and in Lat. 48° 55' 
28". By M. Meffier, Afironomer to the Marine of 
. France, of the Royal Academy of Sciences at Paris, 
Vol. L VI. " b . and 
