DECEMBER, 1806. 



Engravings of the following. Objects : 1. Diagrams by Dr. Hersch^ll, 

 to explain the proper Motion of the Sun. — 2. A new portable Blow- 

 pipe, by W. H. Wollaston, M. D, Sec. R. S. &c.— 3. Plan of six 

 Acres of Water Meadow, as improved by Mr. Wm. Smith. 



I. Facts and Observations respecting Vision under "Water; and vari- 

 ous Particulars relating to Swimming, &c. In a Letter from James 

 Horsburgh, Esq ■> ''-69 



II. On the Quantity and Velocity of the Solar Motion. By William 

 Herschell, LL. p. F. R. S. From the Philosophical Transactions 

 fof 1 806 269 



III. Explanation of the common Impurity in the Nitrate of Ammonia, 

 which interferes with the production of Nitrous Oxide. By Mr. J. 

 Sadler 286 



IV. On the absorption of Electric Light by different Bodies. In a 

 Letter from Mr. Wm. Skrimshire, Jun. to Mr. Cuthbertson . 281 



V. Description of a portable Blow-pipe for Chemical Experiments., 

 • By W. H. Wollaston, M.D. Sec. R. S. &c 284 



VI. Experiments on the growth of White-Thorn. By Sam. Taylor, 

 Esq. of Moston, near Manchester 285 



VII. On the Phantasms produced by disordered Sensation. In a 

 Letter from a Correspondent 288 



VIII. Early account of the Bath Waters. By John Mayow. Ex- 

 tracted from a Letter from W. R. Clanny,M. D. Hon. Member of 

 the Royal Philos. Soc. at Edin. Senior Physician to the Durham 

 Infirmary 296 



IX. The Improvement of Boggy Land by Irrigation, as carried into 

 effect by Mr. William Smith 302 



X. On the Use and Abuse 01 Popular Sports and Exercises, resembling 

 those of the Greeks and Romans, as a National Object. By Samuel 

 Argent Bardsley, M.D. 3 1 ij 



XI. Extract from a Memoir of Vauquelin, read to the French Na- 

 tional lustitiite, oil the Chemical Properties of Oisanite, compared 

 with those of Titanium, and shewing that the former is the first 

 Species of the latter ...,.,..., 32^ 



XII. Scientific News : Report of the Transactions of the'Class of 

 Mathematical and Physical Sciences of the National Institute of 

 France, 324. — University of Gottlngen, 337. — Academy of Useful 

 Sciences at Erfurt, 337. — Wirtemberg, 338. — Planetary Epocha, 

 ^39.— Solar Spots, 349. 



