Royal Society. 459 



of Lime, Bitter-Spar, and .roii-Spar. By William Hvde 

 Woltaston, iVl.D. Sec. K.S. — 9- ObscrvaiiuiiB iiitemled to 

 show ihai the progrtssivt- Mouon ot SiKike-> 15 jiartly pc-r- 

 formtd bv means of the Ribs. By Everard Home, E>q. 

 FK.S. — io. An Account cf snme Exoenments on the 

 Coiubmaiions o^ dit^erer.i Metals and Chl:)r'ne, &c. By 

 John Davy, Esq. Con.municated bv *^ir Huniphiy Davy, 

 Km. LL.D. Sec. R.S. — 11. rnrih^-r Exptruiients and Ob- 

 servations on the Action of Poisons on the Ammal System. 

 By B. C. Brodie, Esq. F.R.S. Contn.unicaied to the So- 

 ciety for the Iniprovc-meni ot Anmiai Ciieiuisiry, and by 

 them to the Royal Society. 



The Twelfth Number of Leybourn's Mathematical 

 Repository contains, I. Solutions to the Mathematical 

 Questions proposed m Nnmber X — 2. On the .rreduciule 

 Case of Cubic Equations.— ^. New Properties of thf Conic 

 Sections. — 4. Indeterminate Problems. — .'». On th<. Ellipse 

 and Hvperbola.— 6. On the 110013 oi: Equations of all Di- 

 meuiions. — 7. Properties of tne Right-angled Trian! le. — 

 8. Continuation of Le Gendre's Memoir on Elliptic Tran- 

 •scendentals. — 9. A Series ot new Questions to be answered 

 in a subsequent Number. 



LXXill. Proceeding's of Learned Societies, 



ROYAL SOCIETY. 



JSiNCE our last Report, a paper by Mr. John Daw wns read 

 on some of the combi.iaions ot the tiuoric prmcplt. in 

 thi^ paper Mr. John Davy gave the results o! some expen- 

 rrients on sil cated fluoric ga* and fiuobf>ric gas, and de- 

 scribed a new and more simple method ot procuring ihis 

 last gas; namely, by distilling together a mixiure of thjr 

 boracic acid, fliior spar, and oil of vitriol. He stated the 

 specific gravity ol these gashes, !>nd gave an account (;f ih ir 

 combinations with ammonia. fluoi>oric gas combines n 

 three proportions wuh ammonia, and with the largest pro- 

 portions of the alkaline uan h>rms s dine combinations, liuid 

 at the common temperatures of the atmosphere. 



A paper by Sir H. Davy was rend, on some combina- 

 cions ot phosphorus and sulphur, and on other obji cts of 

 ihemical inquiry. 



In this papLT Sir FT. Davy de'^c.ibcfl pure phosphorous 



acid as a solid crjstaiime bnd>. , voiaulc ai a ujoUtiaie de- 



O g 2 gree 



