two lights, and as soon as this is perceived the thought is grasped and the matter easily memorized. Opposition, or contrast, is a valuable adjunct to memory.
By means of contrast, the beauties of nature, as well as the beauties of thought, are perceived. This fact was once impressed upon the author's mind by a personal experience. While visiting in the southland, he had many occasions to ride out into the country, and on one of these outings he passed through a section of level, sandy land, almost devoid of vegetation and unmarked for miles by sign of human habitation. To the right, some miles distant, stretched a large growth of tall pines, green with the vigor of life and magnified in size through being reflected upon the heavens beyond. Suddenly darkness spread over and around the towering pines, which ap-
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