74 ACCOUNT Of BOOKS. 



Royal Society of its variable Emiflion of Light and Heat ; with Remarks on 

 of London. the Ufe that may poflibly be drawn from Solar Obfervations. 

 By William Herfchel, LL. D. F. R. $.— 3. Obfervations on 

 the Structure and Mode of Growth of the Grinding Teeth of 

 the Wild Boar, and Animal Incognitum. By Everard Home, 

 Efq. F. R. S. — 4. Account of fome Experiments on the Afcent 

 of the Sap in Trees. By Thomas Andrew Knight, Efq. — 

 5. Additional Obfervations tending to inveftigate the Symp- 

 toms of the variable Emiflion of the Light and Heat of the 

 Sun ; with Trials to fet afide Darkening Glafles by tranfmit- 

 ting the Solar Rays through Liquids; and a few Remarks to 

 remove Objections that might be made againft fome of the 

 Arguments contained in the former Paper. By William 

 Herfchel, LL. D. F. R. S.— 6. On an improved Reflecting 

 Circle. By Jofeph de Mendoza Rios, Efq. F. R. S.-—7. Ob- 

 fervations and Experiments upon Dr. James's Powder ; with 

 a Method of preparing, in the Humid Way, a fimilar Sub- 

 itance. By Richard Chenevix, Efq. F. R. S. M. R. I. A.— 

 8. Cafe of a young Gentleman, who recovered his Sight when 

 feven Years of Age, after having been deprived of it by Ca- 

 taracts, before he was a Year old ; with Remarks, By Mr. 

 James Ware, Surgeon. — 9. An Account of fome Galvanic 

 Combinations, formed by the Arrangement of lingle Metallic 

 Plates and Fluids, analogous to the new Galvanic Apparatus 

 of Mr. Volta. By Mr. Humphry Davy, Lecturer on Che- 

 miftry in the Royal Inititution. — 10. A Continuation of the 

 Experiments and Obfervations on the Light which is fponta- 

 neoufly emitted from various Bodies ; with fome Experiments 

 and Obfervations on Solar Light, when imbibed by Canton's 

 Phofphorus. By Nathaniel Hulme, M. D. F. R. S. & A. S. 

 — 11. Experiments on the Chemical Production and Agency 

 of Eledricity. By William Hyde Wollafton, M. D. F. R. S. 

 — 12. Farther Obfervations on the Effects which take place 

 from the Deitru&ion of the Membrana Tympani of the Ear ; 

 with an Account of an Operation for the Removal of a parti- 

 cular Species of Deafnefs. By Mr. Aftley Cooper. 



A Treatife 



