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      Louis Agassiz, after he had spent fifteen years as a teacher of science in this country, when asked what was the best result of his efforts, replied: "I have educated five observers," referring to the five senses. He claimed that the noblest profession in the world was that of teacher; and that especially in science, the teacher's most important work was to train the student in habits of observation. Lowell called it a divine art - that of seeing what others only look at.