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30 does in the air. I am now going to let it loose, and you must watch to see how rapidly it falls. There! [letting the gold loose] there it is, falling as gold should fall.

I am sorry to see our time for parting is drawing so near. As we proceed, I intend to write upon the board behind me certain words so as to recall to your minds what we have already examined; and I put the word as a heading, and I will then add beneath the names of the special forces according to the order in which we consider them; and although I fear that I have not sufficiently pointed out to you the more important circumstances connected with this force of, especially the law which governs its attraction (for which, I think, I must take up a little time at our next meeting), still I will put that word on the board, and hope you will now remember that we have in some degree considered the force of gravitation—that force which causes all bodies to attract each other when they are at sensible distances apart, and tends to draw them together.