The Five Senses of Man

action apparatus appear auditory canal auditory nerve basilar membrane blue body brain called camera obscura cause centre cochlea colours conveyed direction dissonance distance distant object distinctly distinguish ear-bones edge Ernst Heinrich Weber Eustachian tube exactly excited experience external ear fenestra ovalis fibres of Corti field of vision finger fixed fundamental tone greater green harmonics Helmholtz imagine impression incidental images instance instrument inwards irritation labyrinth labyrinthine fluid lens look manner means motion move muscles musical nerve-fibres number of vibrations observed octave olfactory olfactory nerve optic nerve organs of Corti outer passes peculiar perceive perception picture pitch position possess produced rays of light recognise refraction resonator retina seen sensation of light sense of touch sensory circle sensory organs single skin smell sound sound-waves spectrum string substances suppose surface sympathetic vibrations takes place terminal tion tube tuning-fork tympanic cavity tympanic membrane violet waves whilst yellow spot