The Five Senses of Man

action apparatus appear auditory canal auditory nerve basilar membrane body brain camera obscura cause centre cochlea colours convex lens conveyed direction dissonance distance distinctly distinguish ear-bones entire Ernst Heinrich Weber Eustachian tube excited experience external ear fact fenestra ovalis fibres of Corti field of vision finger fundamental tone hand harmonics Helmholtz Illusion imagine impression instance instrument International Scientific Series irritation labyrinth lens manner motion muscles nerve-fibres number of vibrations observed octave optic nerve organs of Corti outer papillæ passes peculiar perceive perception picture pitch position possess pressure produced Prof rays of light recognise refraction retina seen sensation of light sense of locality sense of touch sensory circle sensory nerves sensory organs single skin smell sound sound-waves spectrum stereoscopic string substances surface sympathetic vibrations tactile takes place taste terminal tion tube tuning-fork tympanic cavity tympanic membrane vitreous humour waves whilst