CINXE.COM

<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:cc="http://creativecommons.org/ns#" xmlns:foaf="http://xmlns.com/foaf/0.1/" xmlns:h="http://www.hathitrust.org" lang="en" xml:lang="en" version="XHTML+RDFa 1.0"> <head profile="http://www.w3.org/1999/xhtml/vocab"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <link about="[_:uc1.b3728192]" rel="foaf:isPrimaryTopicOf" href="https://hdl.handle.net/2027/uc1.b3728192" /> <title>The philosophical magazine, ser.5 v.17. - Text-only - Full View | HathiTrust Digital Library</title> <meta name="viewport" content="width=device-width, initial-scale=1" /> <link rel="stylesheet" href="/common/alicorn/css/main.201910.css" type="text/css" /> <link rel="stylesheet" href="/ssd/ssdstyles.css" type="text/css" /> <script src="/common/alicorn/js/utils.201910.js"></script> <script src="/ssd/access_banner.js"></script> <script src="/ssd/toc_links.js"></script> </head> <body><div id="mdpUberContainer"><div id="mdpHeaderContainer"><div id="mdpPageHeader"><a name="top" id="top"></a><h1>The philosophical magazine, ser.5 v.17. | HathiTrust Digital Library</h1><p><a style="font-weight: bold" href="https://hdl.handle.net/2027/uc1.b3728192?urlappend=%3Bseq=392"> View this item in the Book Viewer </a></p><p>Use of this online version is subject to all U.S. copyright laws. Please do not save or redistribute this file.</p><div id="SSDcontact">For questions or comments, contact HathiTrust.org at <a href="mailto:support@hathitrust.org">support@hathitrust.org<br /></a></div><div><p>You have one page at a time access to this item. Authenticated members of HathiTrust institutions who have a print disability may have full-text access to this item. <a href="http://babel.hathitrust.org/cgi/wayf?target=https%3A%2F%2Fbabel.hathitrust.org%2Fcgi%2Fssd%3Fid%3Duc1.b3728192%3Bseq%3D392%3Bnum%3D352" id="loginLink"> Login</a> to determine if you have access and see all volumes that are available when searching. For more information, see <a href="http://www.hathitrust.org/accessibility">HathiTrust Accessibility</a>. Page at a time access to this item is also available via our fully-styled HathiTrust interface.</p></div><div id="SSDjumps"><a href="#biblio">Go to full bibliographic information</a><br /><a href="#toc">Go to table of contents</a><br /><a href="#SkipToBookText">Skip table of contents and go to current page</a></div><div id="mdpItemMetadata"><h2><a name="biblio" id="biblio"></a>Full Bibliographic Information</h2><div class="mdpMetaDataRow"><div class="mdpMetaDataRegionHead">Title</div><div class="mdpMetaText"><span about="[_:uc1.b3728192]" property="dc:title" rel="dc:type" href="http://purl.org/dc/dcmitype/Text" content="The philosophical magazine, ser.5 v.17.">The philosophical magazine, ser.5 v.17.</span></div></div><div xmlns:METS="http://www.loc.gov/METS/" xmlns:PREMIS="http://www.loc.gov/standards/premis" id="mdpFlexible_1"><div class="mdpMetaDataRow"><div class="mdpMetaDataRegionHead">Published </div><div class="mdpMetaText"><span property="cc:attributionName" rel="cc:attributionURL" href="https://hdl.handle.net/2027/uc1.b3728192" content="London, England :Taylor &amp; Francis,1798-c1977."></span><span property="dc:publisher" content="London, England :Taylor &amp; Francis,1798-c1977.">London, England :Taylor &amp; Francis,1798-c1977.</span></div></div><div class="mdpMetaDataRow"><div class="mdpMetaDataRegionHead">Description </div><div class="mdpMetaText">v. :ill. ;25 cm.</div></div><div class="mdpMetaDataRow"><div class="mdpMetaDataRegionHead">Rights </div><div class="mdpMetaText"><a target="_blank" href="http://www.hathitrust.org/access_use#pd-google">Public Domain, Google-digitized. </a></div></div><div class="mdpMetaDataRow"><div class="mdpMetaDataRegionHead">Permanent URL </div><div class="mdpMetaText"><a href="https://hdl.handle.net/2027/uc1.b3728192">https://hdl.handle.net/2027/uc1.b3728192</a></div></div></div></div></div></div><div id="ControlContentContainer"><div class="mdpControlContainer"><div id="mdpContentsList"><p></p><h2><a name="toc" id="toc">Table of Contents</a></h2><ul><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=1;num=">Front Cover</a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=7;num=i">Title Page<span> on page number i</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=9;num=iii">Table of Contents<span> on page number iii</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=15;num=1">Section 1<span> on page number 1</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=38;num=24">Section 2<span> on page number 24</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=46;num=30">Section 3<span> on page number 30</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=64;num=46">Section 4<span> on page number 46</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=77;num=59">Section 5<span> on page number 59</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=87;num=69">Section 6<span> on page number 69</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=93;num=75">Section 7<span> on page number 75</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=100;num=82">Section 8<span> on page number 82</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=129;num=111">Section 9<span> on page number 111</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=137;num=119">Section 10<span> on page number 119</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=155;num=135">Section 11<span> on page number 135</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=164;num=142">Section 12<span> on page number 142</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=170;num=148">Section 13<span> on page number 148</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=177;num=155">Section 14<span> on page number 155</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=178;num=156">Section 15<span> on page number 156</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=187;num=163">Section 16<span> on page number 163</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=197;num=173">Section 17<span> on page number 173</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=213;num=188">Section 18<span> on page number 188</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=220;num=194">Section 19<span> on page number 194</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=244;num=214">Section 20<span> on page number 214</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=271;num=239">Section 21<span> on page number 239</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=277;num=245">Section 22<span> on page number 245</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=283;num=249">Section 23<span> on page number 249</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=299;num=265">Section 24<span> on page number 265</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=309;num=275">Section 25<span> on page number 275</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=316;num=282">Section 26<span> on page number 282</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=338;num=302">Section 27<span> on page number 302</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=352;num=314">Section 28<span> on page number 314</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=359;num=321">Section 29<span> on page number 321</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=366;num=328">Section 30<span> on page number 328</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=392;num=352">Section 31<span> on page number 352</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=407;num=367">Section 32<span> on page number 367</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=417;num=377">Section 33<span> on page number 377</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=432;num=392">Section 34<span> on page number 392</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=438;num=398">Section 35<span> on page number 398</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=445;num=403">Section 36<span> on page number 403</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=451;num=409">Section 37<span> on page number 409</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=480;num=438">Section 38<span> on page number 438</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=489;num=447">Section 39<span> on page number 447</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=501;num=459">Section 40<span> on page number 459</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=533;num=487">Section 41<span> on page number 487</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=540;num=492">Section 42<span> on page number 492</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=559;num=507">Section 43<span> on page number 507</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=617;num=565">Index<span> on page number 565</span></a></li><li class="mdpFeatureListItem"><a href="/cgi/ssd?id=uc1.b3728192;seq=624;num=">Section 44</a></li></ul></div></div><div id="mdpContentContainer"><a name="SkipToBookText" id="SkipToBookText"></a><h2 id="seq392">Section 31 - Page 352</h2><div id="mdpPage"><p class="Text">352 Mr. J. J. Hood on the Rate of trace of the second spectrum is to be detected. The reason is to be found in the enormous temperature existing in these bodies. But in the case of stars such as a Orionis, a Herculis, &c., which, judging from their complicated spectra, are in a more advanced stage of cooling, the appearance of the second hydrogen spectrum would not, under these circumstances, be remarkable, since observation shows that the characteristic spectrum is either entirely absent in these stars, or only feebly present. Nevertheless the verification of this expectation by observation must always be nearly or quite impossible on account of feeble intensity of light; and the same is à fortiori true of the nebulæ, in which the appearance of the second hydrogen spectrum, together with the characteristic line Hg, might have been expected, upon other grounds, with a certain degree of probability. XL. On the Rate of Chemical Absorption of Gases, with regard to their Interdiffusion. By JOHN J. HOOD, B.Sc., Assoc. R.S.M.* [Plate X. fig. 4.] ITH the exception of Graham's work on the diffusion of gases, their rates of passage through porous dia- phragms or minute apertures into a vacuum, and Loschmidt's experiments on free diffusiont, no measurements of any note have been made bearing on this important subject. The former chemist has shown that the lighter a gas is the more rapidly does it pass through a porous diaphragm, or, as it is expressed, the rate of diffusion varies as the reciprocal of the square root of the density. The experiments of Loschmidt, which were performed by placing two tubes containing different gases over each other, opening a channel between them, and after a certain time determining the amount of the gases that had exchanged places, gave measurements of the rate of interdif- fusion of the one gas into the other. The results obtained by this method of studying diffusion, a physical process somewhat different from that of the passage of a gas through a porous diaphragm or minute aperture into a vacuum as worked out by Graham, show a relation to exist between the molecular weights of the gases and their rates of interdiffusion, but which relation is not quite clear‡. * Communicated by the Author. + Wiener Sitzungsberichte, 1870; extended by Wretschko and by Benigar, Bd. lxii. Meyer, Kinetische Theorie der Gase, 1877, p. 164. </p><p><a class="navigation" href="/cgi/ssd?id=uc1.b3728192;page=ssd;view=plaintext;seq=391;num=351"> Previous Page </a><br /><a class="navigation" href="/cgi/ssd?id=uc1.b3728192;page=ssd;view=plaintext;seq=393;num=353"> Next Page </a><br /> Return to <a href="#top">top</a>. </p></div></div></div></div><script type="text/javascript">var gaJsHost = (("https:" == document.location.protocol) ? "https://ssl." : "http://www."); document.write(unescape("%3Cscript src='" + gaJsHost + "google-analytics.com/ga.js' type='text/javascript'%3E%3C/script%3E")); </script> <script type="text/javascript"> try { var pageTracker = _gat._getTracker("UA-954893-23"); // turn semicolons into ampersands for analytics reporting pageTracker._setDomainName(".hathitrust.org"); var href = (location.pathname + location.search).replace(/;/g, '&'); pageTracker._trackPageview(href); } catch(err) { } try { // track hierarchy if ( location.pathname.indexOf("XXX/cgi/pt") > -1 ) { var nextTracker = _gat._getTracker('UA-39581946-1'); nextTracker._setAllowHash(false); nextTracker._setDomainName(".hathitrust.org"); href = [location.pathname]; var url = $.url(); href.push("id=" + encodeURIComponent(url.param('id'))); if ( location.pathname == '/cgi/pt' ) { href.push("view=" + url.param('view')); if ( url.param('seq') ) { href.push("seq=" + url.param('seq')); } } else { href.push("start=" + (url.param('start') ? url.param('start') : "1")); } href = href.join("/"); nextTracker._trackPageview(href); } } catch(err) { console.log(err); } </script> </body> </html>