A History of Hindu Chemistry from the Earliest Times to the Middle of the Sixteenth Century A.D. v1.c10.t13.1

v1.c10.t13.1

"To account for sound originating in one place being heard in another, it is observed, that sound is propagated by undulation, wave after wave, radiating in every direction, from a centre, like the blossoms of a Nauclea. It is not the first, nor the intermediate wave, that is the sound heard; but the last that comes in contact with the organ of hearing: and therefore it is not quite correct to say, that a drum has been heard. Sound originates in conjunction, in disjunction, or in sound itself. The conjunction of cymbals, or that of a drum and stick, may serve to exemplify the first. It is the instrumental cause. The rustling of leaves is an instance of disjunction being the cause of sound. In some cases, sound becomes the cause of sound. In all, the conformity of wind or its calmness is a concomitant cause: for an adverse wind obstructs it. The material cause is in every case the ethereal fluid: and the conjunction of that with the sonorous subject is a concomitant cause."