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Updated: May 20, 2025
As soon as I see an object, my eyes must be struck by it; I can not conceive of light and of vision without a motion in the luminous, extended, and colored body which communicates itself to my eye, or which acts upon my retina. As soon as I smell a body, my olfactory nerve must be irritated or put into motion by the parts exhaled from an odorous body.
'When the eyelids wink at a flash of light, or a threatened blow, a reflex action takes place, in which the afferent nerves are the optic, the efferent, the facial. When a bad smell causes a grimace, there is a reflex action through the same motor nerve, while the olfactory nerves constitute the afferent channels.
The 'olfactory', or first pair of nerves, have a double origin, namely, from the 'corpus striatum' and the base of the 'corpus callosum'. They are prolongations of the medullary substance of the central portion of the brain. They are the largest of the cerebral nerves.
As she gradually had lost her sight and hearing, and, consequently, speech was more and more difficult for her, Lottie's sense of touch and of smell were being sharpened. Her olfactory nerves were almost as keen as a dog's. How she loved the scent of flowers! She named many of the blossoms in the gardens about just by the odor wafted to her upon the air.
Branches of olfactory nerve. 4. Olfactory bulb. *The Sensation of Smell.*—The sense organs of smell are found in the mucous membrane lining the upper divisions of the nasal cavities. Here are found two kinds of cells in great abundance—column-shaped epithelial cells and the cells which are recognized as the sense organs of smell.
Mere plants can love the light and turn to it, but have not the beautiful mercy to share their loveliness with foul places. The human heart is a finer work. It can, if it will, turn its white light upon darkness, so that out of it even a single seed may take heart and grow. A fastidious olfactory nerve has no right to dominion over the quality of mercy.
"Surely, yes," said Vaura; "one we almost invariably make on coming abroad, should we be located at an hotel for many days, where they don't as a rule, cater to one's olfactory nerves, we journey to some of the conservatories and rob them of many odorous blossoms, to brighten our temporary home; this time we carry a large order for Haughton Hall, so large indeed, that I should not wonder; did the vendors take us for market gardeners; robbing sweet sunny Paris to brighten and perfume our London fog."
Even in this modified chordaea-theory the six fundamental organs of the chordula would retain their great value. The medullary tube would be originally a chemical sensory organ, a dorsal olfactory tube, taking in respiratory-water and food by the neuroporus in front and conveying them by the neurenteric canal into the primitive gut.
W. Ogle has made some curious observations on the connection between the power of smell and the colouring matter of the mucous membrane of the olfactory region as well as of the skin of the body. I have, therefore, spoken in the text of the dark-coloured races having a finer sense of smell than the white races.
The brain of a fish is very small, compared with the spinal cord into which it is continued, and with the nerves which come off from it: of the segments of which it is composed the olfactory lobes, the cerebral hemisphere, and the succeeding divisions no one predominates so much over the rest as to obscure or cover them; and the so-called optic lobes are, frequently, the largest masses of all.
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