. Manuel de l'histoire naturelle, de géologie et de physique du Groenland et des régions avoisinantes / préparé pour l'utilisation de l'expédition arctique de 1875, sous la direction de la Commission de l'Arctique de la Royal Society et édité par T. Rupert Jones. Avec des indications suggérées par le Comité de l'Arctique de la Société royale pour l'utilisation de l'expédition / Publication autorisée par les Lords commissaires de l'Amirauté [microform]. Histoire naturelle ; les expéditions scientifiques ; sciences naturelles ; Expéditions scientifiques. i I 372 BIÈRE, FLORE MIOCÈNE DU GROENLAND. Est m- M Sequoia semperviren

• Contributeur: Library Book Collection / Alamy Banque D'Images
• ID de l’image: RJ0HCK
• Taille du fichier: 7,1 MB (176,4 KB Téléchargement compressé)
• Autorisations: Modèle - non | Propriété - non
• Dimensions: 1458 x 1713 px | 24,7 x 29 cm | 9,7 x 11,4 inches | 150dpi

Informations supplémentaires

Cette image appartient au domaine public, ce qui signifie que le droit d’auteur a expiré ou que le titulaire du droit d’auteur a renoncé à ses droits. Les frais facturés par Alamy couvrent l’accès à la copie haute résolution de l’image.

Cette image peut avoir des imperfections car il s’agit d’une image historique ou de reportage.

. Manual of the natural history, geology and physics of Greenland and the neighbouring regions / prepared for the use of the Arctic expedition of 1875, under the direction of the Arctic Committee of the Royal Society and edited by T. Rupert Jones. Together with Instructions suggested by the Arctic Committee of the Royal Society for the use of the expedition / published by authority of the Lords Commissioners of the Admiralty [microform]. Natural history; Scientific expeditions; Sciences naturelles; Expéditions scientifiques. i I 372 BEER, MIOCENE FLORA OF GREENLAND. IS m- M Sequoia sempervirens^ Lnmb (Red-wood), is its present represen- tative, and resembles it so closely that we may consider S. semper' virens to be the direct descendant of S. Langsdorffii. This tree is cultivated in most of the botanical gardens of Europe, and its extreme northern limit may bo placed at lat. 53' N. For its existence it requires a summer temperature of 60° F. Its fruit requires a temperature of 65° F. for ripening. The winter temperature must not fall below 31° F., and that of the whole year must be at least 50° F. Accordingly wo may consider the iso- thermal of 50° as its northern limit. This we may then take as the northern temperature of the Sequoia Langsdorffiiy and 50° F. ns the absolute minimum of temperature under which the vegetation of Ataiiekerdluk could have existed there. The present annual temperature of the locality is about 20° F. Dove gives the normal temperature of the latitude (70° N.) at 16° F. Thus Greenland has too high a temperature ; but if we como further to the eastward we meet with a temperature of 33° F. at Altenfiord. Even this extreme variation from the normal conditions of climate is 17° F. lower than that which we ore obliged to assume as having prevailed during the Miocene period. The author states that the results obtained confirm his conclu- sions as to the climate of Central Europe at the same epoch (conf. Heer, Recherches sur leClimat

Recherche dans la banque de photos par tags

• bookcentury1800
• bookdecade1870
• booksubjectnaturalhistory
• les livres