p an apparatus to perform the brasses as the cese may require; this process of adjustment apart, yet only on" object is seen. When I was a boy I work better than he has been doing it; a machine to give out may of course be. repeated until the brasses are worn out. often amused myself in observing… … The First Steamboat on the Mississippi. Fig. 3 shows a good substantial form for the ends of par- very nearly parallel. It seems that the small difference in To the Editor of the Scientific American : allel rods; the outer ring, O, must be large enough to let the images has much to do with the…