In Our Chronological Arrangement Of This Progress, Incidental And Detached Notices Respecting Their Commerce Will Occur, Which, Though They Could Not Well Be Introduced In The General View, Yet Will Serve To Render The Picture Of It More Complete.

It is evident that the principal accessions to geographical knowledge among the Romans, at least till their ambition was satinted, or nearly so, by conquest, must have been derived from their military expeditions.

It is only towards the time of Augustus that we find men, whose sole object in visiting foreign countries was to become acquainted with their state, manners, &c.

Polybius is one of the earliest authors who give us a glimpse of the state of geographical knowledge among the Romans, about the middle of the second century before Christ, the period when he flourished. lie was the great friend of Scipio, whom he accompanied in his expedition against Carthage. From his enquiries while in Africa, he informed himself of the geography of the northern parts of that quarter of the world; and he actually visited the coast as far as Mount Atlas, or Cape Nun, beyond which, however, he does not seem to have proceeded. He wrote a Periplus, or account of his voyage, which is not in existence, but is referred to and quoted by Pliny. He possessed also more accurate information of the western coasts of Europe than was had before; derived, it would appear, from the voyages of some Romans. Yet, with all this knowledge of what we may deem distant parts, Polybius was ignorant of the real shape of Italy, which he describes as stretching from east to west; a mistake which seems to have originated with him, and was copied by Strabo.

Varro, who was Pompey's lieutenant during the war against the pirates, and obtained a naval crown on that occasion, among the almost infinite variety of topics on which he wrote, was the author of a work on navigation; unfortunately, however, only the title of it is extant: had it yet remained, it would have thrown much light on the state of navigation, geography, and commerce among the Romans in his time.

Julius Caesar's attention to science in the midst of his wars and perils is well known. He first formed the idea of a general survey of the whole empire; and for this purpose obtained a decree of the senate. The survey was finished by Augustus: the execution of it was committed to three Greek geographers. The survey of the eastern portion of the empire was committed to Zenodoxus, who completed it, in fourteen years, five months, and nine days. The northern division was finished by Theodoras in twenty years, eight months, and ten days: and the southern division was finished in twenty-five years, one month, and ten days. This survey, with the supplementary surveys of the new provinces, as they were conquered and added to the empire, formed the basis of the geography of Ptolemy. It appears from Vegetius, that every governor of a province was furnished with a description of it, in which were given the distance of places, the nature of the roads, the face of the country, the direction of the rivers, &c.: he adds, that all these were delineated on a map as well as described in writing. Of this excellent plan for the itineraries and surveys of the Roman empire, from which the ancient geographers obtained their fullest and most accurate information, Julius Caesar was the author.

Julius Caesar certainly added much to geographical knowledge by his conquests of Gaul and Britain: his information respecting the latter, however, as might be expected, is very erroneous. Yet, that even its very northern parts were known by name to the Romans soon after his death, is apparent, from this circumstance, that Diodorus Siculus, who died towards the middle of the reign of Augustus, mentions Orkas; which, he says, forms the northern extremity of the island of Britain. This is the very first mention of any place in Scotland by any writer.

One of the first objects of Augustus, after he had reduced Egypt, was to explore the interior of Africa, either for the purpose of conquest, or to obtain the precious commodities, especially frankincense and aromatics, which he had learned were the produce of those countries. AElius Gallus was selected by the emperor for this expedition, and he was accompanied by the geographer Strabo; who, however, has not given such accurate information of the route which was pursued as might have been expected. This is the more to be lamented, as Pliny informs us that the places which were visited during this expedition are not to be found in authors previous to his time.

Gallus was directed by the emperor to explore Ethiopia, the country of the Troglodytae and Arabia. The expedition against Ethiopia, which Gallus entrusted to Petronius, we shall afterwards examine, confining ourselves at present to the proceedings and progress of Gallus himself. His own force consisted of 10,000 men, to which were added 500, supplied by Herod, king of the Jews; and 1000 Nabathians from Petra; besides a fleet of eighty ships of war and 130 transports. Syllaeus, the minister of the king of the Nabathians, undertook to conduct the expedition; but as it was not for the interest either of his king or country that it should succeed, he betrayed his trust, and, according to Strabo, was executed at Rome for his treachery on this occasion. His object was to delay the expedition as much as possible: this he effected by persuading Gallus to prepare a fleet, which was unnecessary, as the army might have followed the route of the caravans, through a friendly country, from Cleopatris, where the expedition commenced, to the head of the Elanitic Gulf. The troops, however, were embarked, and, as the navigation of the Sea of Suez was intricate, the fleet was fifteen days in arriving at Leuke Kome: here, in consequence of the soldiers having become, during their voyage, afflicted with various disorders, and the year being far advanced, Gallus was obliged to remain till the spring.

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