CONTENTS, lii 



JULY, 1804.. 



Engravings of tlie following Objp(Els : 1. Sketch of the Orbits of the New Pla- 

 nets, by Jerome de Lalande ; 2. Cryftals of Arfeniated Copper, by Hauy; 

 3. Figures to ilWiftrate a Procefs for Telegraphic Converfation at confiderable 

 Diflances, in which the Human Figure itfelf conttitiUes the Telegraph ; 4. A 

 Machine for levelling the Surface of Land, by Mr. David Charles j 5. Shaded 

 SeiSions of a Clock, which ftnkes the Houi's by fimpler Mechanifm, and with 

 p-reater Regularity than ufual, by Means of a Pendulum fubftituted in the 

 Place of a Fly. 



I. On the fuppofed Chemical Affinity of the Elements of Common Air ; with 

 Remaiks on Dr. Thompfon's Obfervations of that Subjeft. In a Letter from 

 Mr.J. Dalton .... 1^2 



II. Eal'y Methods of completing Tables of Squares and Cubes. In a Letter 

 from H. G. -^ - - - 150 



III. Problems in Spheroidal Triangles, By Peregrinns Proteus 151 



IV. Defcription of a ftriking Part for a Clock, in which the Intervals between 

 Stroke and Stroke are not regulated by a Fly, but by a Pendulum. By Mr. 

 Edward MafTey - - - - lg2 



V. Dcfcription of a very fimple Telegraph, confifting of the Human Figure, 

 adapted to converfe at a Diilance by means of Signs - 154 



VI. Account of a Faft refpefting W'ater heated in a Boiler of Stone j with 

 Obfervations. By Mr, J. C. Hornblower - - ]Qg 



VII. Facis and Obfervations tending to elucidate the Theory of Galvanifm. 

 By a Correfpondent - - - . j-^j 



VHI. Experiments with the Ele£rric Pile, by Mr. Ritter of Jena. Communi'- 

 cated by Mr. Orfted - . _ _ i^g 



IX. Account of a Machine f )r laying Land level. By Mr. David Charles 181 



X. Experiments on Magnetifm ; by Mr. Ritter, of Jena. Communicated by 

 Dr. Orfted, of Copenhagen - - - 134 



XL Obfervations on Arfeniated Copper. By Hauy - igy 



XII. Obiervations upon the Docl:rine of Count Rumford refpefling the Want of 



direfl: conducting Power in Fluids with Regard to Heat. By Cir. Berthollet 198 



XHL A M:.'nioir on the Movements which certain Fluids receive from the 



Contafl of other Fluids. By J. Draparnaud, Curator and Profeffor of Natural 



Hiftury, at the Medicinal School of ]>.Iontpelier - - 201 



XIV. Letter from Mr. Cuthbertlbn reipc(5ling his Galvanic and Eleftricai 

 Experiments _ . . _ gg- 



XV. Chemical Examination of the Ochroites, a Mineral not hitherto well known, 

 containing a New E?rth. By Klaproth - - 207 



XVI. Letter from Van Marum to J. C. Delamctherie, on Ritter's Galvanic 

 Experim.ents _ - . _ 212 



XVII. Experiments on Light ; by Mr. Ritter of Jena. Communicated by Dr. 

 Orfted - - - - - 214 



XVIII. On Spontaneous Inflammations. By J. C. Bartholdi, Prufeftbrof Phyfic 

 and Chemiftiy - - - - 216 



XIX. Difcove.-y of Two New Metals in Crude Platina. By Smithfon Tennant, 

 Efq. F. R. S. - - - _ 220 



Scientific News and Account of Books, 222 — Figure of the Orbits of the New 

 Planets, By Jerome de Lalande, ib. — Philofophical Tranfaftions of the Royal 

 Society of London, for the Year 180-1, Part I. ^to, 182 Pages, with 5 Plates 

 and '2G Pages of Metereoiogical Journal, ib. — Analytical Eflays towards pro- 

 rooting the Chemical Knowledge of Mmeral Subftances* By Martin Henry 

 Klaprcth, Frofeiroroi Chemiftry, &c. 223. 



AUGUST. 



