The very early commerce of the Arabians, by means of caravans, with India, and their settlements on the Red Sea and the coasts of Africa and India at a later period, for the purposes of commerce, have been already noticed. Soon after they became the disciples of Mahomet, their commercial and enterprizing spirit revived, if indeed it had ever languished; and it certainly displayed itself with augmented zeal, vigour, and success, under the influence of their new religion, and the genius and ambition of their caliphs. Persia, Syria, Egypt, Africa, and Spain, were successively conquered by them; and one of their first and most favourite objects, after they had conquered a country, was the amelioration or extension of its commerce. When they conquered Persia, the trade between that country and India was extensive and flourishing: the Persian merchants brought from India its most precious commodities. The luxury of the kings of Persia consumed a large quantity of camphire, mixed with wax, to illuminate their palaces; and this must have been brought, indirectly, through India, from Japan, Sumatra, or Borneo, the only places where the camphire-tree grows: a curious and striking proof of the remote and extensive influence of the commerce and luxury of Persia, at the time it was conquered by the Arabians. The conquerors, aware of the importance of the Indian commerce, and of the advantages which the Tigris and Euphrates afforded for this purpose, very soon after their conquest, founded the city of Bassora: a place, which, from its situation midway between the junction and the mouth of these rivers, commands the trade and navigation of Persia. It soon rose to be a great commercial city; and its inhabitants, directing their principal attention and most vigorous enterprize to the East, soon pushed their voyages beyond Ceylon, and brought, directly from the place of their growth or manufacture, many of those articles which hitherto they had been obliged or content to purchase in that island. Soon after the conquest of Persia was completed, the Caliph Omar directed that a full and accurate survey and description, of the kingdom should be made, which comprehended the inhabitants, the cattle, and the fruits of the earth.

The conquest of Syria added comparatively little to the commerce of the Arabians; but in the account which is given of this enterprize, we are informed of a large fair, which was annually held at Abyla, between Damascus and Heliopolis, where the produce and manufactures of the country were collected and sold. In the account given of the conquest of Jerusalem by the Arabians, we have also an account of another fair held at Jerusalem, at which it is probable the goods brought from India by Bassora, the Euphrates, and the caravans, were sold. As soon as the conquest of the western part of Syria was completed, the Arabians took advantage of the timber of Libanus, and of the maritime skill of the Phoenicians, which even yet survived: they fitted out a fleet of 1,700 barks, which soon rode triumphant in the Mediterranean. Cyprus, Rhodes, and the Cyclades, were subdued, and Constantinople itself was attacked, but without effect.

The conquest of Egypt, however, was of the most importance to the Arabian commerce, and therefore more especially demands our notice.--"In their annals of conquest," as Gibbon remarks, "the siege of Alexandria is perhaps the most arduous and important enterprize. The first trading city in the world was abundantly replenished with the means of subsistence and defence." But the Saracens were bold and skilful; the Greeks timid and unwarlike; and Alexandria fell into the possession of the disciples of Mahomet. As soon as the conquest of Egypt was completed, its administration was settled, and conducted on the most wise and liberal principles. In the management of the revenue, taxes were raised, not by the simple but oppressive mode of capitation, but on every branch from the clear profits of agriculture and commerce. A third part of these taxes was set apart, with the most religious exactness, to the annual repairs of the dykes and canals. At first, the corn which used to supply Constantinople was sent to Medina from Memphis by camels; but Omrou, the conqueror of Egypt, soon renewed the maritime communication "which had been attempted or achieved by the Pharaohs, the Ptolemies, or the Cæsars; and a canal, at least eighty miles in length, was opened from the Nile to the Red Sea. This inland navigation, which would have joined the Mediterranean and the Indian Ocean, was soon, however, discontinued, as useless and dangerous;" and about the year 775, A.D., it was stopped up at the end next the Red Sea.

The conquest of Africa, though not nearly so advantageous to the commerce of the Arabians, was yet of some importance to them in this point of view: it gradually extended from the Nile to the Atlantic Ocean. Tripoly was the first maritime and commercial city which their arms reduced: Bugia and Tangier were next reduced. Cairoan was formed as a station for a caravan; a city, which, in its present decay, still holds the second rank in the kingdom of Tunis. Carthage was next attacked and reduced; but an attempt was made by forces sent from Constantinople, joined by the ships and soldiers of Sicily, and a powerful reinforcement of Goths from Spain, to retake it. The Arabian conquerors had drawn a strong chain across the harbour; this the confederate fleet broke: the Arabians for a time were compelled to retreat; but they soon returned, defeated their enemies, burnt Carthage, and soon afterwards completed the conquest of this part of Africa.

The beginning of the eighth century is remarkable for their invasion of Spain, and for their second fruitless attack on Constantinople; during the latter, their fleet, which is said to have consisted of 1800 vessels, was totally destroyed by the Greek fire. With regard to their conquest of Spain, it was so rapid, that in a few months the whole of that great peninsula, which for two centuries withstood the power of the Roman republic at its greatest height, was reduced, except the mountainous districts of Asturia and Biscay, Here also the Arabians displayed the same attention to science by which they were distinguished in Asia: ten years after the conquest, a map of the province was made, exhibiting the seas, rivers, harbours, and cities, accompanied with a description of them, and of the inhabitants, the climate, soil, and mineral productions. "In the space of two centuries, the gifts of nature were improved by the agriculture, the manufactures, and the commerce of an industrious people." The first of the Ommiades who reigned in Spain, levied on the Christians of that country, 10,000 ounces of gold, 10,000 pounds of silver, 10,000 houses, &c. "The most powerful of his successors derived from the same kingdom the annual tribute of about six millions sterling. His royal seat of Cordova contained 600 mosques, 900 baths, and 200,000 houses: he gave laws to 80 cities of the first order, and to 300 of the second and third: and 12,000 villages and hamlets were situated on the banks of the Guadalquivir."

The religious prejudices, as well as the interests of the Arabians, led them to exclude the Christians from every channel through which they had received the produce of India. That they were precluded from all commercial intercourse with Egypt, is evident, from a fact noticed by Macpherson, in his Annals of Commerce. Before Egypt was conquered by the Arabians, writings of importance in Europe were executed on the Egyptian papyrus; but after that period, at least till the beginning of the ninth century, they are upon parchment.--This, as Macpherson observes, amounts almost to a proof, that the trade with Egypt, the only country producing papyrus, was interrupted.

In consequence of the supply of silks, spices, and other oriental luxuries which Constantinople derived from the fair at Jerusalem, (still allowed by the Arabians to be annually held,) not being sufficient for the demand of that dissipated capital, and their price in consequence having very much increased, some merchants were tempted to travel across Asia, beyond the northern boundary of the Arabian power, and to import, by means of caravans, the goods of China and India.

Towards the beginning of the ninth century, as we have already remarked, the commercial relations of the Arabians and the Christians of Europe commenced, and Alexandria was no longer closed to the latter. The merchants of Lyons, Marseilles, and other maritime towns in the south of France, in consequence of the friendship and treaties subsisting between Charlemagne and the Caliph Haroun Al Rasched, traded with their ships twice a year to Alexandria; from this city they brought the produce of Arabia and India to the Rhone, and by means of it, and a land carriage to the Moselle and the Rhine, France and Germany were supplied with the luxuries of the east. The friendship between the emperor and the caliph seems in other cases to have been employed by the former to the advancement of the commercial intercourse between Asia and Europe; for we are expressly informed, that a Jewish merchant, a favourite of Charlemagne, made frequent voyages to Palestine, and returned with pictures,--merchandize before unknown in the west.

Hitherto we have viewed the Arabians chiefly as fostering and encouraging commerce; but they also deserve our notice, for their attention to geographical science and discoveries. From the period of their first conquests, the caliphs had given orders to their generals to draw up geographical descriptions of the countries conquered; and we have already noticed some of these descriptions. In 833, A.D., the Caliph Almamon employed three brothers of the name of Ben Schaker, to measure a degree of latitude, first in the desert of Sangdaar, betweeen Racca and Palmyra, and afterwards near Cufa, for the purpose of ascertaining the circumference of the globe.

We now arrive at the era of a most important document, illustrative of the commerce of the eastern parts of India and of China, with which we are furnished by the Arabians: we allude to the "ancient Accounts of India and China, by two Mahomedan travellers, who went to those parts in the ninth century, translated from the Arabic by Renaudot." The genuineness and authenticity of these accounts were for a long time doubted; but De Guignes, from the Chinese annals, has completely removed all doubt on the subject.