vi CONTENTS. 
NUMBER V.—NOVEMBER. 
Page 
Sketch of the Geology of Snowdon, and the surrounding Country. By 
W. Phillips, FLS. MGS.; and S. Woods, MGS,..... 2.2... eee. eee 321 
On Siliceous Petrifactions imbedded in Calcareous Rock. By the Rev. 
J.J. Conybeare, MGS. 2.0... .ceeee eee r ence en eect eee e cence neele awenes 335 
On the Geology of the Malvern Hills. By the Rev. J. J. Cony beare, MGS. 337 
Reply to Messrs. Young and Bird. By N. J. Winch, Esq. .......++.- - 339 
On some peculiar Crystals of Sulphate of Potash. By R. Phillips, FRS. 
L.& E. FLS. &c. ; and W. Phillips, FLS. &e. (With.a Plate.) .... 340 
On the Composition of the Alkaline Sulphurets. By M. Berzelius (con 
PNUD) < sinierc oicinie.cse/nielsia ee Seimeyiptsiqsie.e sive alelele taveistereWbsroieika Sates jemi Ee 343 
Astronomical Observations. By Col. Beaufoy, FRS........ ita etatatebaratets 357 
On the Ductility of Glass. By J. Deuchar, Esq. .......-....+ ajaulaia: GO 
A Proposal for impelling Steam Vessels by horizontal Motion instead of 
Circular. , By. the Rev... W.. Ritchie) .205). 25,<.. spisiast nies) aete sian abet 361 
Some Improvements of Lamps. By James Smithson, Esq. FRS........ 363 
On Works in Niello and the Pirotechnia of Venoceio Biringuccio Siennese. 
By the Rev. J. J. Conybeare, MGS. ..........esceeteceddeeecneetes 364 
Analytical Account of Philosophical Transactions for 1822. Part I.... 370 
Letter to Sir H. Davy from Mr. Babbage on the 
Application of Machinery for the Purpose of Calculating and Printing 
WParhematicalul ablesgis jelie.cesaaasersisise bide «laure seine mia\e oils cee 383 
Proceedings of the Geological Society, June 21 ...... Satsiorsiernitrs ammeter maNB88 
Effect of Fixed Oils in destroying the Smell of Essential Oils............ 388 
Analyses of Magnesite. 0.0... sess seeceeeeseeeeteeeeeenestenteeeer eres 389 
Analyses of Native Carbonate of Magnesia ..1+..++ sesseseteeee seen enee 389 
On the Greek Fire of the Middle Ages ...........ssecsceeecsceesceecee 389 
Royal Institution of Cornwall. .......6..-s sees eens eeeeeeeeen enon eenees 395 
Alkohometrical Application of the Thermometer. .......+..eeeeeseeeeee 395 
Tabular Spar, Colophonite, and Pyroxene ............eeeeeeeesees cee? 396 
Peath of Dr. Marcét. (6 285 ocak aise ciclolate Hislere fol, adhe Sere mine uemsiape 397 
Death of Mr. James Sowerby ......0.0esreeersscesees aa jerehaerere te davavms 397 
New Scientific, Books:...... ss... scale clavecie ounce ojeais cee sisiveire ee) si rer nes yd 
iNlepy ALCO ES. «5 oie coils hatin an el siete as) eee driers obras ieraiacsiedincomiain aaa 398 
Mr. Howard's Méieorological Journal for September. ...0..++s-eeeeeeee 399 
—— 
NUMBER VI.—DECEMBER. 
Sketch of the Geology of Snowdon, and the surrounding Country. By 
W. Phillips, FLS. MGS.; and S. Woods, MGS. (concluded) With a 
Pate shacataspve No isale wea evento tion palm aioe ce ta heise seeisinieia =. «5 eines eas 401 
On the Ultimate Analysis of Vegetable and Animal Substances. By W. 
Prout VIDS RSS dei. cicicetin snrenscae eels piaeteeiasletelsielais ote ati ed staiee;e 424 
On the Geology of Lindisfarn. By N. J. Winch, Esq. (With a Plate.) 426 
On the Greek Fire. By the Rev. J. J. Conybeare, MGS.....+.++++00. 484 
