_Discoveries, Inventions, and Achievements_.--It cannot be successfully claimed that the Arabians exhibited very much originality in the advancement of the civilized arts, yet they had the ability to take what they found elsewhere developed by other scholars, improve upon it, and apply it to the practical affairs of life. Thus, although the Chinese discovered gunpowder over 3,000 years ago, it remained for the Arabs to bring it into use in the siege of Mecca in the year 690, and introduce it into Spain some years later. The Persians called it Chinese salt, the Arabians Indian snow, indicating that it might have originated in different countries. The Arab-Moors used it in their wars with the Christians as early as the middle of the thirteenth century. They excelled also in making paper from flax, or cotton, which was probably an imitation {313} of the paper made by the Chinese from silk. We find also that the Arabs had learned to print from movable type, and the introduction of paper made the printing-press possible. Linen paper made from old clothes was said to be in use as early as 1106. Without doubt the Arab-Moors introduced into Spain the use of the magnet in connection with the mariner's compass. But owing to the fact that it was not needed in the short voyages along the coast of the Mediterranean, it did not come into a large use until the great voyages on the ocean, in the beginning of the fourteenth century. Yet the invention of the mariner's compass, so frequently attributed to Flavio Giorgio, may be as well attributed to the Arab-Moors. Knives and swords of superior make, leather, silk, and glass, as well as large collections of delicate jewelry, show marked advancement in Arabian industrial art and mechanical skill. One of the achievements of the Arab-Moors in Spain was the introduction of agriculture, and its advancement to an important position among the industries by means of irrigation. The great, fertile valleys of Spain were thus, through agricultural skill, made "to blossom as the rose." Seeds were imported from different parts of the world, and much attention was given to the culture of all plants which could be readily raised in this country. Rice and cotton and sugar-cane were cultivated through the process of irrigation. Thus Spain was indebted to the Arab-Moors not only for the introduction of industrial arts and skilled mechanics, but the establishment of agriculture on a firm foundation.