Known as the Early Journal Content, this set of works include research articles, news, letters, and other writings published in more than 200 of the oldest leading academic journals. The works date from the mid--seventeenth to the early twentieth centuries. We encourage people to read and share the Early Journal Content openly and to tell others that this resource exists. People may post this content online or redistribute in any way for non--commercial purposes. Read more about Early Journal

more »

... ntent at http://about.jstor.org/participate--jstor/individuals/early-journal--content. JSTOR is a digital library of academic journals, books, and primary source objects. JSTOR helps people discover, use, and build upon a wide range of content through a powerful research and teaching platform, and preserves this content for future generations. JSTOR is part of ITHAKA, a not--for--profit organization that also includes Ithaka S+R and Portico. For more information about JSTOR, please contact support@jstor.org. ¢ UnlefsX srldeedX the srredllcible lblac.k powders obtaine-d tJy Me TILLETX tould-be thought to place platina among the itnSerfed mctalss Scc-Mem. dc tt Roy d¢a st1¢uC. § 7792 pe 4o4? & 7 X t-Z2-@ Sngelation; f >kfilter 33-! AS itl lOfi dikoveries, much depends UpOll accident, fo, on 0:this 4 OCCaflOn, A. BRAUN uildiertook the experiments br a very diS iretlt oWeS: frona that wlaich prefellteel itSelf in the cour{e of then< ancl at the fug,geRioll of arlother perfon. trIlis getltlC nzan was Dr. Jos ERNEST ZEIMER9 ProfeSor of Mecllanice, in the fatme Actadeny, svho 11aviIag repeated FAIRENHEITeS experitnents witll zrigoriSb tniXtUltS iIl GermaTly, })C0ore llC calue t-o fettle at Peterb=urg, ssrithed to try srTlether tl-ley mightnot be proSecuted further in tEle great ratural cold svEich fometitnes preVails ill that city. IlllaeEs pl4evetlted Dr. zzX-Et from carryitag his ideas i-tlto execution:; he therefore cotumutacated them to ProSeilor sRAuNs wvho was-already nauch converfatlt i-tl-thertnolnetrical experimeratsg alk etlgaged hitn to take up the fubjed of artificial ceId w-hellever the Bteather Ihorqld 1)C-favourat31e for thi-s purpofe. A proper opportunity occurred os t;he I 4t:h of Decenlberg X 7597 O. SSe the-thermornerer fink ilag in: the opetw-air fo low as-34 of F^X^REsHEIT s Scale7 which we llow kilow to be viffiin a few degrees:of the point at whicil merctlry freezes-. M. ERAU:N-accordillgly prepared a fri-: -p;orific rzixturewitll aaqWaJortis aIld pourlded ice, lJyrneans of whrich }ais thermometer was reduced to 69OX Ionver, by-almoI} 3o degrees, tharl it 11at1 fillen: ill any precefding experimerlt:s of this natureO ;P:art o:f the quickfilver had-1)orv really cotlaled, yet fo firvas M. BRAUN from entertaitaitlg a--ftlfpicion-of that fort and b etltirelvs weres his views direSd to arother-objedS that he acknowledges he -had well-lligh defiffid froln a110 furither tirials9 coutelat with llaving thus much; exceeded fuch elminent philofophers as F^AHRENHEI.T) MUSSCHENBROECK,; alld R!EAUMUR.= Animated, however7 by the hope that a RillgreatelX degree siS cold might-1Je produceda he entered-upon rlle experiment: anew , * 5, cou144 .