An Introduction to the Study of Zoology : By T. H. Huxley, F. R. S. ; With Eighty-Two Illustrations
The book An Introduction to the Study of Zoology : By T. H. Huxley, F. R. S. ; With Eighty-Two Illustrations was written by author Huxley Thomas Henry Here you can read free online of An Introduction to the Study of Zoology : By T. H. Huxley, F. R. S. ; With Eighty-Two Illustrations book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is An Introduction to the Study of Zoology : By T. H. Huxley, F. R. S. ; With Eighty-Two Illustrations a good or bad book?
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When a muscle is connected by its motor nerve with a ganglion, irritation of that ganglion wiU bring about the contraction of the muscle, as well as if the motor nerve itself were irritated. Not only so ; but if a sensory nerve, which is in connexion with the ganglion, is irritated, the same effect is produced ; moreover, the sensory nerve itself need not be excited, but the same result will take place, if the organ to which it is distributed is stimulated. Thus the nervous system is fundamenta...lly an apparatus by which two separate, and it may be dis- tant, parts of the body, are brought into relation with one another ; and this relation is of such a nature, that a change of state arising in the one part is followed by the propagation of changes along the sensory nerve to the ganglion, and from the ganglion to the other part ; where, if that part happens to be muscle, it produces contraction. If one end of a rod of wood, twenty feet long, is applied to a sounding-board, the sound of a tuning-fork held against the opposite extremity will be very plainly heard.
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