CONTENTS. iii 



JULY 1803. 



Engravings of the following Objects : 1. An Ancient Secret Lock of Thirteen 

 Hundred Combinations; 2. An Apparatus for Diitillation, by Sir A. N. 

 Edelcrantz; 3. Galvanic Apparatus, by Mr. Davy; 4. Electrical Battery of 

 Talc; 5. Compound Artificial Magnet of Four Poles; 6. The Swedifh Tele- 

 graph invented by Sir A, N. Edelcrantz. 



I. On the Naturalization of Plants. By John Templeton, A.L. S. From the 

 Irilh Traniaaions, Vol. VIII. - - 145 



II. A Method of remedying certain Inconveniences arifing from the Inequality 

 of Heat in large Diftillatiom By Sir A. N. Edelcrantz. - 156 



III. Account of a Time-Piece for regiftering the Attendance of Watchmen, 

 and for fimilar Purpofes; conftru6led by MefTrs. Boulton and Watt, for the 

 Rt. Hon. the Marquis of Exeter. In a Letter from his Lordfhip. 158 



IV. Some Account of the Poifonous and Injurious Honey of North America. 

 By Benj. Smith Barton, M. D. i$y 



V. On the Compofition andUfeof Chocolate. By Citizen Parmentier. 175 



VI. On the Caules by which the Oxigen of the Atmofphere is fupplied or reno- 

 vated. In a Letter from Mr. RoDert Harrup. - - - 184 



VII. Report on a Memoir fent to la Societe Libre des Pharmaciens, of Paris. 

 By Cit. Robert, Chief Phyfician to the Hofpital of Humanity at Rouen. By 

 Citizens C. L. Cadet and Boullay. - - - - 189 



VIII. Defcription of a Telegraph ufed in Sweden.' Conftrucled by Sir A. N. 

 Edelcrantz, Counfellor of the Chancery, and private Secretary to the King of 

 Sweden, Archivift of the Orders of His Majefty, and One of the Eighteen 

 Members of the Swedifh Academy. From the Copy of a Treatife on Tele- 

 graphs, communicated by the Author. - - - -193 



IX. Additional Obfervations on the Probability that the Eruptions of Lunar Vol- 

 canos may lbraetimes reach the Earth. By a Correfpondent. - 201 



X. Defcription of an Ancient Lock of Combination. W. N. - 203 



XI. Analyiis of a Pulmonary Calculus. By Philip Crampton, M. D. Member 

 of the Royal College of Surgeons in Ireland. Communicated by the Honour- 

 able George Knox, F. R. S. M. R. I. A. &c. - /- - 205 



XII. Of the State of Vapour fubfifting in the Atmofphere. By Richard Kirwan, 

 Efq. LLD. F.R.S. andP.R. I. A. - ,- - - 207 



XIII. Notices concerning fome Philofophical Apparatus. ---Electrical Battery of 

 Talc— Complex Horfefhoe Magnet.— -Mr. Davy's Apparatus, &c. 216 



XIV. Experiment to determine the relative Quantities of Light afforded by 

 Candles of different Dimenfions, in a Letter from a Correfpondent. 219 



Scientific News, 220. — On the Nutriment to be obtained from Bones, ib. — Me- 

 thod of preparing Muriatic Ether with fimple Acid ; by M. BafTe, Apothecary 

 at Hameln, 221. — On the Effects produced by the Decortication of Trees. 222 



Account of New Books, 223. — Refearches into the Properties of Spring Water, 

 with Medical Cautions (iiluftrated by Cafes) againft the Ufe of Lead in the 

 Conftruclion of Pumps, Water Pipes, Cifterns, &c. ib. — Uieful Hints to thofe 

 who are afflicted with Rupturer; on the Nature, Cure, and Confequence of 

 the Difeafe ; and on the Empirical Practices of the piefent Day. 224 



AUGUST 



