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pens (Populus trepida). The growth of this tree, instead of a renewal of the pine-forest, may be attributed either to a change in the nature of the soil, perhaps by the introduction of a great er quantity of alkaline matter, to its winged seeds favouring its dispersion, -or to both causes conjoined. The ashes of the poplar yield much more alkali than those of any of the pines do. Fires frequently spread amongst the

dry grass in the plains of Carlton House; but their principal effect there seems to be the production of finer pasture in the following season. They do not seem in general severe enough to destroy the roots of the grass, or to burn the soil. The migrations of the herds of the bison or buffalo, are much influenced by the extent and direction of these fires.

TABLE XI.-Arrangement of Plants growing in the Hudson's Bay countries, and adjoining Lands, from Lat. 53° N., and to the eastward of Long. 116° W.

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