The Moorish invader had to fight for his possession--every yard of it. Yet despite that, this energetic race found time to colonise, to develop and enrich the subjugated region with a thoroughness the evidence of which faces us to-day. We do not refer to their cities or to such monuments in stone as the Mezquita or Alhambra, but to their introduction into rural Spain of much of what to-day constitutes chief sources of the country's wealth, and which might have been enormously increased had Moorish methods been followed up. The Koran expressly ordains and directs the introduction of all available fruits or plants suitable to soil that came, or comes, under Moslem dominion. "The man who plants or sows the seed of anything which, with the fruit thereof, gives sustenance to man, bird or beast does an action as commendable as charity"--so wrote one of their philosophers. "He who builds a house and plants trees and who oppresses no one, nor lacks justice, will receive abundant reward from the Almighty." There you have the religion both of the good man and the good colonist. These precepts the Moors habitually and energetically carried out to the letter. Arboriculture was universal: the provinces of Valencia, Cordoba, and Toledo they filled with trees--fruit-trees and timber. In the warm valleys of the coast and in the sheltered glens of the mountains they acclimatised exotic fruits, plants, and vegetables hitherto restricted to the more benign climes of the East or to Afric's scorching strand. Sugar-cane flourished in such luxuriance as to leave available a heavy margin for export. The fig-tree and carob, quince and date-palm, the cotton-plant and orange, with other aromatic and medicinal herbs, together with aloes and the anachronous-looking prickly-pear (_Cactus_), its amorphous lobes reminiscent of the Pleistocene, were all brought over for the use and benefit, the delight and profit of Europe. Of these, the orange to-day forms one of Spain's most valuable exports, representing some three millions sterling per annum. [Illustration: TYPES OF SPANISH BIRD-LIFE GRIFFON VULTURE (_Gyps fulvus_) Abounds all over Spain: sketched while drying his wings after a thunderstorm, in the Sierra de San Cristobal, Jerez.] Silk and its manufacture represented another immense source of wealth and industry introduced into Spain--to-day extinct. The Moors covered Andalucia with mulberry-groves: in Granada alone ran 5000 looms for the weaving of the fibre, and the streets of the Zacatin and the Alcarcería became world-markets, where every variety of costly stuffs were bought and sold--tafetans, velvets, and richest textures that surpassed in quality and brilliancy of tint even the far-famed products of Piza, Florence, and the Levantine cities which since Roman days had monopolised the silk-supply of the world. These now found their wares displaced by Spanish silks; even the sumptuous "creations" of Persia and China met with a dangerous rivalry.