CONTENTS OF N» 7.— New Series. 



I. Collections in Foreign Geology. — [No. I.] By H. T. De la 

 Beche, Esq. F.R., L. and G.S. &c. &c. {To be continued). .... .page 1 



II. Observations relatives a un Article de Mr. Ivory, insdre dans 

 le No. 5. du Philosophical Magazine, &c. N. S. pour Mai 1827. Par 



M. PoissoN, F.R.S. &c 11 



III. A Letter to Professor Airy, in Reply to his Remarks on some 

 Passages in a Paper by Mr. Ivory. By J. Ivory, Esq. M.A. F.R.S. 16 



IV. On Exceptions to the Law that Salts are more soluble in hot 

 than in cold Water ; vifith a new Instance. By Thomas Graham, 

 M.A 20 



V. Symmetrical Properties of Plane Triangles. By T. S. Da vies, 

 Esq. of Bath. [With a Plate.] 26 



VI. On the Semi-arcs of Vibration of a Clock with a Dead Beat 

 Scapement and Deal Pendulum. By Thomas Squire, Esq 34 



VII. On Mechanical Science. By D— t 38 



VIII. A further Account of the great Mass of Native Iron of Bit- 

 burg. By Messrs. Steininger and Noeggerath; with Observa- 

 tions by Dr. C. F. F. Chladni 41 



IX. On Meteoric Iron from Mexico, By Dr. J. Noeggerath. In 



a Letter to Dr. Chladni 46 



X. On the Method of the Least Squares, as employed in Determin- 

 ing the Figure of the Earth, from Experiments with the Pendulum, 

 as well as by the Measurements of Arcs. By W. Galbraith, 

 Esq. A.M. 48 



XI. A Synopsis of the Genera of Saurian Reptiles, in which some 

 new Genera are indicated, and the others reviewed by actual Ex- 

 amination. By J. E. Gray, Esq. F.G.S. &c 54 



XII. Corrections in a Work entitled Chemical Manipulation. 



By Michael Faraday, Esq. F.R.S. &c 58 



XIII. Notices respecting New Books: — Faraday's "Chemical 

 Manipulation." 58 



XIV. Proceedings of Learned Societies : Royal Society ; Royal 

 Institution of Great Britain ^ 66 — 68 



XV. Intelligence and Miscellaneous Articles : — Fluor Spar and 

 Anhydrous Sulphuric Acid ; Rheine, a peculiar Substance in Rhu- 

 barb ; Zanthopicrite, a new Vegetable Colouring Principle; Althein, 

 a peculiar Substance in Marshmallow; Meteorite which fell near 

 Ferrara in 1824 ; Composition of Iron Scales ; Quantity of Silver and 

 Gold raised in Guanaxuato ; Native Iron found in Canaan, Conn. 

 U.S.; Discovery of Fossil IIya;nas in Kent; On Register- Rain- 

 (jauges, by Mr. H. Bevan, Civil Engineer; Mr. Squircs's Comparative 

 Observations of the Solar Eclipse of Nov. 19, 1826; New Patents ; 

 Meteorological Observations, Table, &c 68—80 



•^' It is requested that all Communications for this Work may be addressed, 

 post fluid, to the Care of Mr. R, Taylor, Printer, RedLion-Court, Flcct- 

 btrcct, London. 



