

SCIENTIFIC VtW?. l$b 



tended with good nature. Hcrfchel wili not be diverted from 

 purfuing his difcoveries, bccaufe the inhabitants of Laputa. 

 give themfelves too much anxiety about the fun's good health. 

 Let the man of wit enjoy his joke, and the man of experi- 

 ment his rational toys, provided both unite in cultivating that, 

 amiable fpirit of philanthropy, on which the happinefs of tocia? 

 intercourfe fo much depends. 



SCIENTIFIC NEWS. 



Extract of a Letter from Dr. Lorenz de Crell. (Helm- 

 jladt, Dec. 14, 1801.) On the Chlorophane and a fuppofed 

 Variety of Bajrytes. 



JL HE Prince of Gallitzin, F.R.S. pofleflbr of a moft excel- The chlorophane 



lent mineralogical cabinet, and living now as a private in- Iofes lts lumi " 



° . ° r nous property by 



dividual at Brum wick, has obferved that the chlorophane, or cxpofure to light* 



that Siberian flufs-fpar, which, after being gently heated on 



charcoal, turns green (on account of which it is called pyro- 



fmaragdus in the Chemifche Annaleh) and on being cooled 



regains its former colour ; that the chlorophane, I fay, loft 



this property on being expofed in a tin box to the rays of the 



fun in a window during the fummer. It was turned quite 



colourlefs, and exhibited no light at all on being heated.— 



The Count of Hoffmanfegg, whofe travels to Portugal (for Barytes nobiiJ* 



difcoveries in natural hiftory) were written by Profefior Linck, 



his companion, has brought with him two ftones, greatly re- 



iembling quartz, or rock cryftal externally, but without 



regular figure ; giving fparks with fteel, but of far greater 



fpecihc gravity, viz. 3,500. It (hewed fome electricity on 



friction. This new kind of ftone (for fuch it is thought by 



good mineralogifts) is to be analyfed chemically. In the 



mean time Dr. Bruckman, who is well known by his books 



on precious ftones, thinks proper to call it barytex nob'ilia. 



Corrindon or Adamantine Spar found near Philadelphia. 



M. Guillemard, a learned mineralogift, who has travelled Corrindon or 

 much in North America, writes to Dr, Delam^therie, that » dan »? ti "« ***** 

 Mr> Adam Seybcrt has difcovcred corrindon or adamantine r ka. 



fpar 



