will be astonished atthe ease with which you will succeed in retainingtwenty or more words, absolutely classified in yourmind as if on drawing paper, so that when you areasked the number the name will come to your mind,and reciprocally. This is a pleasing diversion forfamily reunions on long winter… … Fig. l.-THE SKELETON SPHERE. & the action of the windmill, by the sailing of vessels, andin other ways. The grandest example of the centri-fugal action of air is furnished by some of the move-ments of the entire atmospheric envelope of the earth ;the upward currents at and in the vicinity of…
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