FROM the land of the Turks-Turkestan in Central Asia-there descended beginning in A.D. 800 a series of hordes and armies which overran and gradually took possession of that portion of South-Eastern Europe and Western Asia once known as Turkey. After five hundred years Mohammed II seized upon Constantinople, and that city became the capital of the Turkish Empire;-for the next two hundred years the dominion spread until it became an immense and important world-power. Then began a period of decline; and vice and prodigality in harem and seraglio brought about disruption and war. Russia saw her opportunity to extend her borders towards the sea-and went on gaining Turkish territory from early in the 18th until the middle of the 19th century when the Crimean war crippled her power in that corner of Europe. But Turkey could not hold the heterogeneous populations of her European provinces. Insurrection after insurrection broke out and one by one she lost many of the more important of them. She became bankrupt and a concert of the European Powers proposed and partially carried out a scheme for her reform. But she proved stubborn and went to war with Russia in 1877-1878; this ended disastrously for her and more territory was lost.