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 In 1823, twenty years after the Louisiana Purchase, the utterance of the Monroe Doctrine announces to the world the position of the United States in the Occident. Meantime internal waterways and highroads have been developed; and subsequently, during the presidency of Jackson, the steam locomotive is introduced. The year 1845 marks the annexation of Texas; and with the cession of New Mexico and California in 1848, the country virtually assumes its present proportions. Almost a century has passed since the nondescript Captain Carver, immediately after the French and Indian War, conceived the idea of opening up the vast north-western tract to the enterprise of Great Britain. The interest of travellers has shifted from the character and habits of the roving Indian to the domestic manners of East and West, North and South; and science has moved from a less impersonal, yet fairly exact, observation of plants and animals, or of subterranean rivers in a terrestrial paradise, to the precise geology of a Featherstonhaugh or a Lyell. This period of travel saw the rise of modem geography as an exact science, and the development of the ancillary sciences, geology, botany, zoology, and anthropology. If the great epoch of modern geographical discovery began with 1768 and the voyages of the Englishman Captain Cook, the scientific elaboration of results by Continental investigators also mainly occupied the second half of the eighteenth century. Linnaeus was still alive, and had followers collecting specimens in America. Zimmermann, who translated the Travels of William Bartram into German, likewise ushered in the study of the geographical distribution of plants and animals as well as of mankind; while Blumenbach the anthropologist was making his famous collection of human skulls at Gottingen. The first work on physical geography ever published, that of the Swede Bergman, appeared in 1766, shortly before the time when books of American travel began to grow numerous. The influence of Continental science upon American observers is often obvious, as in the case of Linnaeus, to which Zimmermann refers in his translation of Bartram. Indeed, a pupil of Linnaeus, Pehr Kalm, who has been included among the botanists of Philadelphia, is remembered for his description of Niagara Falls. But the influence was pervasive and general, so that geography
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