OCR Text |
Show good organ of Corti. Why is it - that scratching a j piece of glass with metal causes j such an unpleasant, sound? Because Be-cause it id what is called the (fundamental tone of the ear, which is v ,-ry' high. What the fundamental tone exactly is would take too much space to explain, but if you blow across the mouth of a bottle, a hollow globe, etc., you get its fundamental tone. The organ of hearing is one of the most marvelous pieces of mechanism in the body, fn animals ani-mals the external ear acts as a trumpet to collect the sound j waves; in man it is jitt o mere than an ornament, buttle internal inter-nal ear isalike in bct'i; So wonderful won-derful is its construct! n th&t we can distinguish ounis varying from forty to 4,000 vibrations per second. This feat is perform- ! ed by a portion of the ear called the organ of Corti. What a won- ': derful organ that is may be un-i derstood from the faot. t.w. ' i consists of 5.0CO pieces of ap-" paratus, each piece being made ' up of two rods, one inner hair i cell and four outer bair cells ' that is, 15,000 separate parts. In some mysterious manner the rods, witi other thin?s, are tuned to different notes and when they vibrate they cause ) the hairs to transmit an impulse t) the nerve of hearing To te musical, therefore, is to have -i i |