CONTENTS. V 



PAGE 



II. Observations on the Atomic Weights of Bodies. By 



Thomas Thomson, M. D. F, R. S., &c 251 



III. Notice of the Parr. By Sir William Jardine, Bart. . 269 



IV. On a very powerful Natural Magnet. By Mr. J. 



Crichton, Glasgow, in a Letter to the Editor . . . 272 



V. The Art of Dyeing continued 274 



VI. Notice of some Recent Improvements in Science . . . 289 



Heat and Light ib. 



Chemistry 292 



VII. Analyses of Books 305 



Proceedings of the Berwickshire Naturalists' Club . . ib. 



VIII. Scientific Intelligence, &c 309 



1 . Adulteration of Jalap Roots ib. 



2. African Guaiac 310 



3. Progress of Geographical Discovery ib. 



4. On Chemical Symbols, in a Letter to the Editor . 312 



5. New mode of heating Apartments 315 



0. Magnetic Characters of the Metals 316 



7. Halley's Comet ib. 



8. Diamonds of the Uralian Mountains 318 



9. Statistics of the Canadas 319 



10. Mode of preserving Minute Animals ib. 



Meteorological Journal. By the Rev. J. Wallace . . 320 



No. XVII.— May. 



I. Memoir of Dr. Thomas Young. By M. Arago, continued 321 



II. Notices of some Minerals. By Thomas Thomson, M.D., 



F.R.S., &c 332 



III. On the Causes of the Motion of the Blood in the Capil- 



lary Vessels. By Dr. Poiseuille ib. 



IV. On the Connexion between refracted and diffracted Light. 



By Paul Cooper, Esq 347 



V. On some Hydrargyro-Cyanurets. By Mr. George Henry 



Jackson • 355 



VI. Experiments and Observations on visible Vibration, conti- 



nued from p. 200. By Charles Tomlinson, Esq. With 

 two wood-cuts 364 



VII. The Art of Dyeing, continued 370 



VIII. Analyses of Books 385 



1. Der Angehende Botaniker, &c. VonT. A. F. Schmidt ib. 



2. Die Mineralquellen von Wildungen von F. Dreves und 

 Wiggers 386 



IX. Scientific Intelligence, &c 387 



1. Proceedings of the Ashmolean Society of Oxford . ib. 



2. Observations on the Steam-engines of Cornwall. By 



W. J. Henwood, F. G. S., London and Paris, &c . 390 



3. Character of Flamsteed. By Mr. Hodgson . . . 392 



4. Discovery of a new Cave, containing Bones . . . 393 



5. Remarkable Case of Convulsions ib. 



6. Botanical Society of Edinburgh 394 



7. On the Instinct of the Water-lien. By P. J. Selby, 

 Esq 395 



8. Corrections of the Paper on Spirits, &c. By Observer 396 



9. Cases of Poisoning 397 



