engraving. Fig. 7, we have two waves, one twice as long a- just as the rods of the auditory nerve are tuned to sound vi- the other, and below them is their resultant, obtained as fol- brations. Fig. 3 gives a still more enlarged view of the lows : Both waves, starting at A, pass up in the same… … ever, the eye is incapable of discriminating more than a very not tell; although we have which is represented at the point, I, below; again, at the limited number. And this brings us to the consideration of reached the extreme end of point, C, the effect of the motion of one curve below the the eye…
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