The common base of all the Semitic creeds, winners or losers, was the ever present idea of world-worthlessness. Their profound reaction from matter led them to preach bareness, renunciation, poverty; and the atmosphere of this invention stifled the minds of the desert pitilessly. A first knowledge of their sense of the purity of rarefaction was given me in early years, when we had ridden far out over the rolling plains of North Syria to a ruin of the Roman period which the Arabs believed was made by a prince of the border as a desert-palace for his queen. The clay of its building was said to have been kneaded for greater richness, not with water, but with the precious essential oils of flowers. My guides, sniffing the air like dogs, led me from crumbling room to room, saying, “This is jessamine, this violet, this rose.”