A lecture on the geography of plants / By John Barton.

  • John Barton
Date:
1827
Catalogue details

Licence: Public Domain Mark

Credit: A lecture on the geography of plants / By John Barton. Source: Wellcome Collection.

    66/120 (page 56)
    lows, of which the utmost height is eighteen or twenty feet. At Nain, on the coast of Labra- dor, in latitude 57°, only one degree nearer to the pole than Edinburgh or Glasgow, the mean temperature of the year is 5° below the freezing point; lower, therefore, by 5°, than the mean temperature of Cape North, the extremity of Europe, in latitude 71°*. In Canada, wdiich lies under the same parallels of latitude with France, the rigour of the winters is destructive to every species of tree excepting those belonging to northern climates; yet the heat of the summers suffices to bring to perfection many of the southern annuals, and such low plants as are protected in winter by the covering of snow. In this country grows the Weymouth Pine, not unfrequently planted in our shrubberies. It is a very beautiful tree when healthy and vigorous; and as it grows remarkably tall and straight, affords the best masts for large ships. Another native of Canada is the Sugar Maple, from whose sap a considerable quantity of sugar is annually prepared by the inhabitants. The vegetable productions of the temperate regions of North America are distinguished by their variety and splendour, compared with those produced in the same latitudes of the \ w Humboldt: Lignes Isothermes.