. Journal of researches into the natural history and geology of the countries visited during the voyage round the world of 'Beagle,' under the command of Captain Fitz Roy. GIANT THISTLE OF PAMPAS. CYNARA CARDUNCULUS, OR CARDOON. to face p. 125. THE CARDOON 125 North America, where coarse grass, between five and six feethigh, when grazed by cattle, changes into common pasture am not botanist enough to say whether the change here isowing to the introduction of new species, to the altered growthof the same, or to a difference in their proportional has also observed wit
. Journal of researches into the natural history and geology of the countries visited during the voyage round the world of 'Beagle,' under the command of Captain Fitz Roy. GIANT THISTLE OF PAMPAS. CYNARA CARDUNCULUS, OR CARDOON. to face p. 125. THE CARDOON 125 North America, where coarse grass, between five and six feethigh, when grazed by cattle, changes into common pasture am not botanist enough to say whether the change here isowing to the introduction of new species, to the altered growthof the same, or to a difference in their proportional has also observed with astonishment this change : he islikewise much perplexed by the immediate appearance of plantsnot occurring in the neighbourhood, on the borders of any trackthat leads to a newly-constructed hovel. In another part hesays,1 Ces chevaux (sauvages) ont la manie de preferer leschemins, et le bord des routes pour deposer leurs excremens,dont on trouve des monceaux dans ces endroits. Does thisnot partly explain the circumstance ? We thus have lines ofrichly-manured land serving as channels of communication acrosswide districts. Near the Guardia we find the southern limit of tw
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