On the dependence of animal motion on the law of gravity by Henry WiglesworthOn the dependence of animal motion on the law of gravity by Henry Wiglesworth

On the dependence of animal motion on the law of gravity

byHenry Wiglesworth

Paperback | February 1, 2012

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1849. Excerpt: ... And why should wo look further for an explanation? Sound philosophy prohibits our searching for causes which are not requisite to explain the phenomena; while it may be readily shewn that this hypothesis is most in accordance with what we know of Physics, and perfectly capable of explaining the action. Moreover, if gaseous force be the true cause of muscular action, we shall be led, by analogy, to admit the probability of its causing other movements in the system. I would therefore explain the action of the nerves on the muscles as follows, selecting for our description a single nerve cell, nerve tube, and muscular fibre, which will equally answer for the whole:--In the nerve cell, the movement is gained by the union of compounds, with a slight impulse--say the oxygen of the blood (which is essential for nervous action) with the hydrogen of the tissues. This is determined by an act of volition, which (as it unquestionably possesses a material influence) we may liken to the cause of muscular action--gentle pressure. Before this force, the moveable fluid in the adjacent nerve tube will be driven--the brain case preventing the enlargement of the cell; and as its impetus will be felt chiefly, if not entirely, at its extremity, the muscular fibre will be at once affected, resulting in its movement. This sudden impulse will be followed by as sudden a recoil; for a condensation occurring in tho union of the supposed gases, three volumes (one of oxygen and two of hydrogen) being condensed into two, a partial vacuum must be formed. This will be equalised in two ways;--first, by the restoration of the fluid in the nerve tube to its former position, under the atmospheric pressure; and, second, by the influx of blood from a neighbouring capillary. Thus will cellular ...
Title:On the dependence of animal motion on the law of gravityFormat:PaperbackDimensions:56 pages, 9.69 × 7.44 × 0.12 inPublished:February 1, 2012Publisher:General Books LLCLanguage:English

The following ISBNs are associated with this title:

ISBN - 10:0217522734

ISBN - 13:9780217522731