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action apparatus appear auditory canal auditory nerve basilar membrane blue body brain camera obscura cause centre cochlea colours direction dissonance distance distinctly distinguish ear-bones edge Ernst Heinrich Weber Eustachian tube excited experience external ear fenestra ovalis fibres of Corti field of vision finger fixed fundamental tone green harmonics Helmholtz i2mo imagine impression instance instrument International Scientific Series inwards irritation labyrinth lens look manner motion muscles musical nerve-fibres number of vibrations observed octave olfactory nerve optic nerve organs of Corti outer passes peculiar perceive perception picture pitch position possess pressure Price produced Prof 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 stereoscopic string substances suppose surface sympathetic vibrations takes place taste terminal tion tube tuning-fork tympanic cavity tympanic membrane violet vitreous humour waves whilst yellow spot
arwin, cr 1882. [Extracts from Darwin's notes] In gj Romanes ...