Royal Society of London. 1 77 



■ bodies become lummniis, jindtdations are excited in this 

 . telher — The third, that colour? are owing to vibratio/is 

 in this aether ailing on the retina — and the fou'-th, that all 

 jTiatter attra6ts this aithcr; and that, when b(^dics arc; lumi- 

 nous, it acts in a more denfc, though not in a more el.-.flic 

 ftate upon them. 



In the meeting on the 26th was read an analvfis of a mi- 

 neral from North America, which contains a metal diflerent 

 from ;iny hiiherto known : bv Charles Ilatcliet, Efq. 



This is an acidiliuble metal, but dift'eVs in fome refpc£ls from 

 thofe acidifiable mctais alrtadv known. A vivid orange-co- 

 loured preciniLaie can be throwri down from one of its folu- 

 tions, which, as it remains unchanged after being expofed to 

 air and light, will be a moft valuable acquilition to arli^s. 

 By another^proccls a green precipitate is obtained. 

 ' It is propofed to give this metal the name of Columhhim. 

 The fpecimen from ptrt of which this analvfis was made is 

 in the Britifli Mufajmn ; but Mr. Hatchet" is in hopes of 

 being able to obtain a frefli fupply from America. 



Part II. of the Philoibphical Tianfactions for 1801, juft 

 publidicd, contains the following articles: 



12/' A Hidorical and Nnatomical Defciiption of a doubtful 

 . amphibious Animal of Germany, called byLaurenti Protcus 

 .Angu'imis. By Charles Schreibcrs, M. D. of Vienna. — 13. 

 Obfervations tending to inveltigate the Nature of the .Sun, 

 in order to find the Caulcs or Svmptoms of its variable 

 Emiflion of J.iwht and Heat ; with Pvem.uks on the Ufe that 

 may polliblv be drawn from Solar Obfcrvatons. By William 

 Hcrfchcl, LL. D. F. R. S. — 14. Obfervations on the Struc- 

 ture, and Mode of Growth, of the grinding Teeth of the 

 Wild Boar, and Animal incognitum. By £verard Home, 

 Efq. F. R. S. — 15. Accounts of fome Experiments on the 

 Afcent of the Sap in Trees. In a Letter from Thomas 

 Andrew ICniglit, Efq. to the Right Hon. Sir Jofeph Banks, 

 "Bart. K. H. P. R. S. — 16. Additional Obfervations tending 

 to inveftigafc the Symptoms of the variable Eniillion of the 

 Light and Heat of the Sun ; with Trials to fet afide dark-n- 

 ine.Glafles,,by tranfniitting the Solar Rays through Liquids; 

 an I a few Remarks to remove Objcuions thntmijhc be made 

 againd fome of rhc Arguments contained in the ivjrmei Pap^^r. 

 By William Hcrichel, LL. D. F. R. S. — 17. On an improved 

 Betkaing Circle. By .loleiih dc Mendoza Uio.^ yS'^^. F.R.S.— • 

 iS Oblervations and Experiments upon Dr. James's J^owder; 

 •with a Method of preparing, in the humid Wav-, a fimilar Sub- 

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

 jy. Cafe of a young Gentleninn, who recovered his Si^ht 

 . Vol. XI. iVl when 



