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Updated: May 4, 2025
The liver goes on a strike, and the body-garbage, which it has failed to burn to clean ashes and clear smoke, poisons the nerve-cells, and they remonstrate accordingly, on behalf of the other tissues. The heart, or blood-vessels, fails to supply a certain muscle with its due rations of blood and the nerves of the region cry out in the agony of cramp.
The lowest flat-worms of to-day may represent some of these early types, and as we ascend the scale of what is loosely called "worm" organisation, we get some instructive suggestions of the way in which the various organs develop. Division of labour continues among the colony of cells which make up the body, and we get distinct nerve-cells, muscle-cells, and digestive cells.
Probably all nerve-cells or nervous material were originally, even in the lowest forms, dimly conscious; then by division of labor some became purely conductive, others more highly perceptive. The important thing for us to remember in our present ignorance is not to be dogmatic.
Nerve-cells, nerve-threads, and muscular fibres may be the agents of feeling and moving, but it is the man that feels and acts; so may myriads of Intelligences be the agents, but it is God who knows and answers. Nothing can be so small as not to affect that delicate omnipresent consciousness, nothing so vast as to transcend it.
The man or woman who is nervous has poisoned nerve-cells, either from hereditary defect, or direct saturation of the tissues with toxic substances. The patient who has an imaginary disease is suffering from some kind of a hallucination produced by poison-soaked nerve-cells, such as in highest degree give rise to the delirium of fevers, and the horrid spectres of delirium tremens.
It is a favorite theory with some modern writers that the physical change from youth to age is accompanied in the body, and in a sense caused by, the deterioration in the quality of the cells of the body, and they call this change a breaking-down process by which the finer and more highly differentiated cells, such, for example, as the nerve-cells, and others which have high and complicated duties to perform, are displaced by cells of an inferior type, which they name conjunctive cells, much as the common sparrow drives away the songbirds from the home garden and, usurping the place of the songbird, substitutes a wretched twitter for the golden notes of the warblers which once delighted our ears.
Dean's exquisite microscopic photographs from sections of the medulla oblongata, which appear to me to promise a new development, if not a new epoch, in anatomical art. It having been settled that the nerve-tubes can very commonly be traced directly to the nerve-cells, the object of all the observers in this department of anatomy is to follow these tubes to their origin.
Summation is attained by the repetition of stimuli at such a rate that each succeeding stimulus is applied before the nerve-cells have returned to the resting stage from the preceding stimulus.
I fancied you cared for my career, and now you end our friendship without a thought!" "We must all follow the law of our being." "The laws are within us and in our control." "They are within us and beyond us. It is the physiological structure of our brains, our nerve-cells, that makes and mars our lives. "Our mental companionship was so beautiful. It was meant to last."
Everyone who admits the principle of evolution, and yet feels great difficulty in admitting that female mammals, birds, reptiles, and fish, could have acquired the high taste implied by the beauty of the males, and which generally coincides with our own standard, should reflect that the nerve-cells of the brain in the highest as well as in the lowest members of the Vertebrate series, are derived from those of the common progenitor of this great Kingdom.
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