6° Nous venons <subst xmlns="http://www.tei-c.org/ns/1.0"> <del rendition="#s">de con</del> <add place="intralinear">d’examiner</add> </subst> <lb xmlns="http://www.tei-c.org/ns/1.0" />la <choice xmlns="http://www.tei-c.org/ns/1.0"> <abbr>haut</abbr> <expan>hauteur</expan> </choice> des arbres sous un point <lb xmlns="http://www.tei-c.org/ns/1.0" />de vue général en comparant <lb xmlns="http://www.tei-c.org/ns/1.0" /><del xmlns="http://www.tei-c.org/ns/1.0" rendition="#s">en gros</del> le <placeName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0009532 http://d-nb.info/gnd/4060997-2">Tropique</placeName> <subst xmlns="http://www.tei-c.org/ns/1.0"> <del rendition="#s">de</del> <add place="superlinear">au</add> </subst> <placeName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0017628">cercle <del rendition="#s"><gap quantity="1" unit="words" /></del> <lb /><subst> <del rendition="#s">le cercle</del> <add place="intralinear">polaire</add> </subst></placeName>. <subst xmlns="http://www.tei-c.org/ns/1.0"> <del rendition="#s">La dist</del> <add place="intralinear">En <lb />entrant</add> </subst> dans <subst xmlns="http://www.tei-c.org/ns/1.0"> <del rendition="#s">un plus grand</del> <add place="intralinear">le <lb />détail</add> </subst> <subst xmlns="http://www.tei-c.org/ns/1.0"> <del rendition="#s">des</del> <add place="superlinear">de ces</add> </subst> mesures<supplied xmlns="http://www.tei-c.org/ns/1.0" cert="high">,</supplied> on aperçoit <lb xmlns="http://www.tei-c.org/ns/1.0" />qu’il y a une <subst xmlns="http://www.tei-c.org/ns/1.0"> <del rendition="#s">rétrécissement</del> <add place="right"><metamark />progression assez <lb /><subst> <add place="intralinear">petite</add> <del rendition="#s">petite</del> </subst> mais</add> </subst> très <lb xmlns="http://www.tei-c.org/ns/1.0" />régulière dans la <subst xmlns="http://www.tei-c.org/ns/1.0"> <del rendition="#s">haut des</del> <add place="intralinear"> <lb />limite des</add> </subst> arbres depuis les 21° <supplied xmlns="http://www.tei-c.org/ns/1.0" cert="high">jusqu’</supplied>aux <lb xmlns="http://www.tei-c.org/ns/1.0" />71°. Leur distance aux neiges est <lb xmlns="http://www.tei-c.org/ns/1.0" />au <placeName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0008847 https://www.geonames.org/3996063">Mexique</placeName> de <measure xmlns="http://www.tei-c.org/ns/1.0" quantity="360" unit="toise">360 <choice> <abbr>t</abbr> <expan>toises</expan> </choice></measure><supplied xmlns="http://www.tei-c.org/ns/1.0" cert="high">,</supplied> au centre <lb xmlns="http://www.tei-c.org/ns/1.0" />de <placeName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0005696 https://www.geonames.org/6255148">l’Europe</placeName> de <choice xmlns="http://www.tei-c.org/ns/1.0"> <sic>de</sic> <corr type="deleted" /> </choice> <subst xmlns="http://www.tei-c.org/ns/1.0"> <del rendition="#s">340</del> <add place="superlinear"><measure quantity="323" unit="toise">323</measure>.</add> </subst> et en <lb xmlns="http://www.tei-c.org/ns/1.0" />Laponie de <measure xmlns="http://www.tei-c.org/ns/1.0" quantity="300" unit="toise">300</measure>.<note xmlns="http://www.tei-c.org/ns/1.0" place="right" hand="#author"><unclear reason="illegible" cert="low">Ces nombres sont le </unclear><lb /><unclear reason="illegible" cert="low">moyen d’un</unclear> <lb /><gap reason="illegible" unit="words" quantity="1" /></note><note xmlns="http://www.tei-c.org/ns/1.0" place="right" hand="#author"><metamark /><subst> <del rendition="#ow">a</del> <add place="across">A</add> </subst>u <placeName ref="https://edition-humboldt.de/H0008847 https://www.geonames.org/3996063">Mexique</placeName><supplied cert="high">,</supplied> <lb />le Pin <lb />(<name type="plant"><choice> <abbr>P</abbr> <expan>Pinus</expan> </choice> <choice> <abbr>occid</abbr> <expan>occidentalis</expan> </choice></name>) <lb />est une <lb />plante <lb />alpine qui <lb /><del rendition="#s">ne</del> commence <lb />là où les arbres finissent <lb /><subst> <del rendition="#s">qu’à</del> <add place="superlinear">en <placeName ref="https://edition-humboldt.de/H0005696 https://www.geonames.org/6255148">Europe</placeName> <supplied cert="high">(</supplied>à</add> </subst> <measure quantity="950" unit="toise">950 <choice> <abbr>t</abbr> <expan>toises</expan> </choice></measure><supplied cert="high">)</supplied> <lb />et finit <lb />à la <choice> <abbr>haut</abbr> <expan>hauteur</expan> </choice> <lb />du <placeName ref="https://edition-humboldt.de/H0009297 https://www.geonames.org/2510569">Pic de <lb />Ténériffe</placeName><supplied cert="high">.</supplied></note> En comparant les <choice xmlns="http://www.tei-c.org/ns/1.0"> <abbr>mont.</abbr> <expan>montagnes</expan> </choice> <lb xmlns="http://www.tei-c.org/ns/1.0" />de la <placeName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0011377 https://www.geonames.org/830603">Laponie</placeName> <subst xmlns="http://www.tei-c.org/ns/1.0"> <del rendition="#s">à la</del> <add place="intralinear">non aux</add> </subst> <unclear xmlns="http://www.tei-c.org/ns/1.0" reason="illegible" cert="high">dépressions</unclear> <lb xmlns="http://www.tei-c.org/ns/1.0" />mais à la pente <choice xmlns="http://www.tei-c.org/ns/1.0"> <abbr>septentr</abbr> <expan>septentrionale</expan> </choice> <lb xmlns="http://www.tei-c.org/ns/1.0" />des <placeName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0002402 https://www.geonames.org/2661786">Alpes</placeName>, on voit les arbres <lb xmlns="http://www.tei-c.org/ns/1.0" /><subst xmlns="http://www.tei-c.org/ns/1.0"> <del rendition="#s">monter</del> <add place="intralinear">s’approcher</add> </subst> <del xmlns="http://www.tei-c.org/ns/1.0" rendition="#s">des</del><del xmlns="http://www.tei-c.org/ns/1.0" rendition="#s"><gap quantity="2" unit="words" /></del> beaucoup <lb xmlns="http://www.tei-c.org/ns/1.0" />plus des neiges sous le cercle <lb xmlns="http://www.tei-c.org/ns/1.0" />polaire que par les 47° de latitude<supplied xmlns="http://www.tei-c.org/ns/1.0" cert="high">.</supplied> <lb xmlns="http://www.tei-c.org/ns/1.0" />Dans le <placeName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0001700 https://www.geonames.org/7729883">Nord de l’Europe</placeName><supplied xmlns="http://www.tei-c.org/ns/1.0" cert="high">,</supplied> la végétation <lb xmlns="http://www.tei-c.org/ns/1.0" />des arbres finit par des bouleaux <lb xmlns="http://www.tei-c.org/ns/1.0" /><name xmlns="http://www.tei-c.org/ns/1.0" type="plant"><choice> <abbr>B.</abbr> <expan>Betula</expan> </choice> alba</name><supplied xmlns="http://www.tei-c.org/ns/1.0" cert="high">,</supplied> <add xmlns="http://www.tei-c.org/ns/1.0" place="right"><metamark />par un <lb />arbre à feuilles <lb />herbacées <lb />qui ne vit pour <lb />ainsi dire <lb />qu’en été</add>, <subst xmlns="http://www.tei-c.org/ns/1.0"> <del rendition="#s">aux</del> <add place="superlinear">dans les</add> </subst> <placeName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0002402 https://www.geonames.org/2661786">Alpes</placeName> et aux <lb xmlns="http://www.tei-c.org/ns/1.0" /><placeName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0008509 https://www.geonames.org/3112616">Pyrénées</placeName><supplied xmlns="http://www.tei-c.org/ns/1.0" cert="high">,</supplied> la végétation finit <lb xmlns="http://www.tei-c.org/ns/1.0" />par le <name xmlns="http://www.tei-c.org/ns/1.0" type="plant">Pinus <choice> <abbr>sylvestr</abbr> <expan>sylvestris</expan> </choice></name> et le <name xmlns="http://www.tei-c.org/ns/1.0" type="plant"><choice> <abbr>P.</abbr> <expan>Pinus</expan> </choice> <lb />mugho</name> qui <subst xmlns="http://www.tei-c.org/ns/1.0"> <del rendition="#s">demandent</del> <add place="superlinear">aiment</add> </subst> des <lb xmlns="http://www.tei-c.org/ns/1.0" />étés <subst xmlns="http://www.tei-c.org/ns/1.0"> <del rendition="#s">moins</del> <add place="superlinear">plus</add> </subst> longs et <lb xmlns="http://www.tei-c.org/ns/1.0" />moins chauds. Le bouleau <pb xmlns="http://www.tei-c.org/ns/1.0" n="II_4v" facs="http://content.staatsbibliothek-berlin.de/dms/PPN82636635X/1200/0/00000008.jpg" /><fw xmlns="http://www.tei-c.org/ns/1.0" type="folNum">8.</fw>demande <subst xmlns="http://www.tei-c.org/ns/1.0"> <del rendition="#s">une force végétative <lb />de</del> <add place="intralinear">pour </add> </subst>développer <subst xmlns="http://www.tei-c.org/ns/1.0"> <del rendition="#ow">les</del> <add place="intralinear">ses</add> </subst> feuilles <lb xmlns="http://www.tei-c.org/ns/1.0" />une <choice xmlns="http://www.tei-c.org/ns/1.0"> <abbr>tempér</abbr> <expan>température</expan> </choice> moyenne <del xmlns="http://www.tei-c.org/ns/1.0" rendition="#s">des mois</del> <lb xmlns="http://www.tei-c.org/ns/1.0" />de <subst xmlns="http://www.tei-c.org/ns/1.0"> <del rendition="#s">8°</del> <add place="intralinear">11°</add> </subst> et en <placeName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0010179 https://www.geonames.org/2658434">Suisse</placeName><supplied xmlns="http://www.tei-c.org/ns/1.0" cert="high">,</supplied> <subst xmlns="http://www.tei-c.org/ns/1.0"> <del rendition="#s">aucun</del> <add place="intralinear"> <lb />à la limite</add> </subst> des grands arbres<supplied xmlns="http://www.tei-c.org/ns/1.0" cert="high">,</supplied> <lb xmlns="http://www.tei-c.org/ns/1.0" />aucun mois d’été n’atteint <lb xmlns="http://www.tei-c.org/ns/1.0" />une <choice xmlns="http://www.tei-c.org/ns/1.0"> <abbr>tempér.</abbr> <expan>température</expan> </choice> moyenne de 9°<supplied xmlns="http://www.tei-c.org/ns/1.0" cert="high">,</supplied> comme <lb xmlns="http://www.tei-c.org/ns/1.0" />nous le savons avec certitude<supplied xmlns="http://www.tei-c.org/ns/1.0" cert="high">,</supplied> <lb xmlns="http://www.tei-c.org/ns/1.0" />non par des calculs <choice xmlns="http://www.tei-c.org/ns/1.0"> <sic>fondé</sic> <corr cert="high">fondés</corr> </choice> <lb xmlns="http://www.tei-c.org/ns/1.0" />sur le décroissement du calorique<supplied xmlns="http://www.tei-c.org/ns/1.0" cert="high">,</supplied> <lb xmlns="http://www.tei-c.org/ns/1.0" />mais <del xmlns="http://www.tei-c.org/ns/1.0" rendition="#s">surtout</del> par des <choice xmlns="http://www.tei-c.org/ns/1.0"> <abbr>obs.</abbr> <expan>observations</expan> </choice> <choice xmlns="http://www.tei-c.org/ns/1.0"> <abbr>météorol</abbr> <expan>météorologiques</expan> </choice> <lb xmlns="http://www.tei-c.org/ns/1.0" />faites pendant 18 ans à l’hos<lb xmlns="http://www.tei-c.org/ns/1.0" break="no" />pice de <placeName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0009940 https://www.geonames.org/2658828"><choice> <abbr>St Goth</abbr> <expan>Saint-Gothard</expan> </choice></placeName> et <lb xmlns="http://www.tei-c.org/ns/1.0" />dans la <placeName xmlns="http://www.tei-c.org/ns/1.0" ref="https://edition-humboldt.de/H0009678 https://www.geonames.org/2658218">vallée d’Ursern</placeName>.