name, and in which many of the commonest technical terms (such as alkali, alembic, alcohol, and many others), still attest their labors. In mathematical science they were no less industrious. To them we owe that simple and useful method which so greatly facilitates the more complex processes of calculation, without which, indeed, some of them would be impossible, and which still retains its Arabic name--Algebra. But what is more, to them we owe our system of notation, so vastly superior to that of the Greeks and Romans, so admirable in its efficacy and simplicity, that it has made arithmetic accessible to the humblest understanding; at the present time, the whole Christian world uses Arabic numerals.--H. [182] It is supposed by many that Turkey will ultimately be won to our civilization, and, as a proof of this, great stress is laid upon the efforts of the present Sultan, as well as his predecessor, to "Europeanize" the Turks. Whoever has carefully and unbiassedly studied the present condition of that nation, knows how unsuccessful these efforts, backed, though they were, by absolute authority, and by the immense influence of the whole of Western Europe, have hitherto been and always will be. It is a notorious fact, that the Turks fight less well in their semi-European dress and with their European tactics, of which so much was anticipated, than they did with their own. The Moslem now regards the Christian with the same feelings that he did in the zenith of his power, and these feelings are not the less bitter, because they can no longer be so ostentatiously displayed.--H. [183] The Arabs believed themselves the descendants of Ishmael, the son of Hagar. This belief, even before Mohammed's time, had been curiously blended with the idolatrous doctrines of some of their tribes.--H. [184] _Philip_, an Arabian adventurer who was prefect of the prætorian guards under the third Gordian, and who, through his boldness and ability, succeeded that sovereign on the throne in A. D. 244.--H. [185] _Odenathus_, senator of Palmyra, after Sapor, the King of Persia, had taken prisoner the Emperor of Rome, and was devastating the empire, met the ruthless conqueror with a body of Palmyrians, and several times routed his much more numerous armies. Being the only one who could protect the Eastern possessions of the Roman empire against the aggressions of the Persians, he was appointed _Cæsar_, or coadjutor to the emperor by Gallienus, the son of Valerian, the captive sovereign.--H. [186] The history of _Zenobia_, the Queen of the East, as she styled herself, and one of the most interesting characters in history, is well known. As in the preceding notes, I shall, therefore, merely draw attention to familiar facts, with a view to refresh the reader's memory, not to instruct him.