The Journal of laryngology and otology . between the points H and J will be acted on by two forces; there-fore, since the phases are in agreement, these fibres will be moved to agreater extent than they would by either of the notes actingseparately. Again, a very small modicum of mathematical know-ledge will enable you to see that every point on the line RX willA-ibrate with an amplititde equal to 2DS.^ That is to say, therewill be no point of maximum amplitude of vibration, but the whole Fig. ^ HRKSNJ % line or section of the basilar membrane EX will be in a conditionof maximum amplitude
The Journal of laryngology and otology . between the points H and J will be acted on by two forces; there-fore, since the phases are in agreement, these fibres will be moved to agreater extent than they would by either of the notes actingseparately. Again, a very small modicum of mathematical know-ledge will enable you to see that every point on the line RX willA-ibrate with an amplititde equal to 2DS.^ That is to say, therewill be no point of maximum amplitude of vibration, but the whole Fig. ^ HRKSNJ % line or section of the basilar membrane EX will be in a conditionof maximum amplitude of vibration relative to the rest of thebasilar membrane. And now, applying the principle of maximumstimulation which I suggested, we see why we do not hear twonotes, although there are undoubtedly tAvo notes present, as youknow when the two forks are sounded. Of course, when the phasesare in opposition there is silence. ^ This is not absolutely true since the co-effieieut of elasticity ^vill vary with thetension. This, however, does not affect the conclusions in the text. June, 1905.] RhinoIo§y, and Otology. 307 Fig. 5 represents the state of matters when the amplitudes are equal. Expressed mathematicallvj Ave sav that: -^=^ 0. When the amplitudes of movement are not exactly equal thenthe condition is that represented by Fig. 6, the notes remaining thesame in pitch as in the last figure. This is shown mathematicallyas follows : Draw DS |! to AE and £DF |j to HJ. Let DS = a = amplitude o
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