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188 what was lifted from the ground. Each of the workers, also, had slung over his shoulder what looked like a small frame. I selected one of the five at random, and watched his proceedings more particularly. Now and then he would unsling the frame and place it on the ground. Then he would give it a little twist, whereupon it would assume a form very like that of a lady's work-table. I saw him do this many times, and each time he took something out of the closed receptacle which I have just mentioned, and placed it on the table, and observed it carefully with some kind of instrument that might have been a kind of microscope. After a more or less minute observation each time, he placed the substance observed in one of the boxes at his girdle, which he opened each time and carefully closed again. By-and-by he seemed to discover some substance which challenged his attention specially, for after a longer observation than usual, he took another instrument from his girdle and observed it more carefully and for a longer time. Then I could see that he called his neighbour, for he looked, and I almost thought that I could see his lips moving, and immediately the other looked up and came towards him. Then the first man handed his observing instrument to the second, who examined very carefully the substance