In whatever disease sleep is laborious, it is a deadly symptom; but if sleep does good, it is not deadly.
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immunology
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The deviation of man from the state in which he was originally placed by nature seems to have proved to him a prolific source of diseases. From the love of splendour, from the indulgences of luxury, and from his fondness for amusement he has familiarised himself with a great number of animals, which may not originally have been intended for his associates.The wolf, disarmed of ferocity, is now pillowed in the lady's lap. The cat, the little tiger of our island, whose natural home is the forest, is equally domesticated and caressed. The cow, the hog, the sheep, and the horse, are all, for a variety of purposes, brought under his care and dominion.
What are called viruses are always dead and incapable of any acts whatsoever. Dead matter may be acted upon but never acts of itself.