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ABOUT SEASICKNESS.

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ABOUT SEASICKNESS. Dr. J. R. Stocker, writing in the Nautical Magazine, on sea sickness, says: "We know that sea-sickness is but seldom due to one individual cause, but most commonly depends upon a com- bination, a concatenation, of causes; and it seems to me that one of its principal physiological condi- tions is the one that I have already suggested, viz., a rarity of the pulmonic atmosphere. Speaking roughly, and for our present purpose, the pneumo- gastric nerve (which I denominate the key of th3 position) supplies the larynx, the lungs, and the stomach, though these are not at all the only organs that it does supply We know, too, well enough, what reflex action means and how it hap- pens it occurs in consequence of intimate nervous connection. We know also that sensations are not always felt and do not always produce effects where they originate or where they may occur, but often I in some near or distant part of the economy, but always in a part which is more or less closely con- nected with it in respect of innervation. We can therefore well believe that irritation or distress affecting a branch or branches of the pneumogastric may be reflected therefrom,and so produce irritation and distress elsewhere. As medical men we know it for a fact. The first effect of the vessel falling is a sense of apprehension, which causes us instinctively, automatically, involuntarily, and al- most unconsciously, to close the glottis and to hold the breath, so as to be ready by fixing the chest for any great or small and sudden exertion. The con- stant and continued repetition of this provokes and irritates the laryngeal branches of the pneumo- gastric nerve, and is of itself sufficient in my opinion to upset the movements of the stomach, and so produce nausea and vomiting. The next effect of the continued fall is the descent of the large abdominal viscera, which draw down and drag upon the diaphragm, and so extend and elongate the thoracic cavity that the pulmonic atmosphere be- comes attenuated. This produces an effect upon the terminal filaments of the pulmonic branches of the pneumogastric nerve (as we find in the mal des mentaignes), which also, being reflected to the stomach, adds fuel to the fire, and results in sea- sickness. It will thus be seen tolerably clearly and conclusively how and why it is that in sea-sickress, pure a simple, I am disposed to throw the blame upon the pneumogastric nerve, and I put it forward as a rational and tangible physiological emanation of the phenomenon.

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