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"In every object." says Carlyle, "there is inexhaustible meaning; the eye sees in it what it brings means of seeing." To see is not merely to receive an image upon the retina. The stimulation of the visual organ becomes sight properly only as the record is conveyed to the consciousness.
The irritability of the cell is easily understood; for, since it is made of very unstable chemical compounds, any slight disturbance or stimulation on one part will tend to upset its chemical stability and produce reaction; and this is what is meant by irritability. Or, again, we may look upon the cell as a little chemical laboratory, where chemical changes are constantly occurring.
The theory that adaptations are due to the heredity of the effects of stimulation assumes that the same stimulus has been acting for many generations. It is necessary, however, to consider how far the conclusions drawn from these experiments are contradicted by the mutations occurring in nature, some of which have already been mentioned. We will consider first ambicolorate specimens.
The experience of this moment, the union of stimulation and repose, constitutes the unique aesthetic emotion. THE popular interest in scientific truth has always had its hidden spring in a desire for the marvelous. The search for the philosopher's stone has done as much for chemistry as the legend of the elixir of life for exploration and geographical discovery.
Some poisonous chemicals killed pieces of metal, rendering them immobile and therefore incapable of registering records on the apparatus. In some cases antidotes were promptly administered, and saved the life of the metal. Prof. Bose also conducted experiments on plants in the same way. Pieces of vegetable matter were found to be capable of stimulation, fatigue, excitement, depression, poison.
Where something approaching drudgery or the need of fulfilling externally imposed tasks exists, the demand for play persists, but tends to be perverted. The ordinary course of action fails to give adequate stimulus to emotion and imagination. So in leisure time, there is an imperious demand for their stimulation by any kind of means; gambling, drink, etc., may be resorted to.
Like the other phenomena of life, pain was undoubtedly evolved for a particular purpose surely for the good of the individual. Like fear and worry, it frequently is injurious. What then may be its purpose? We postulate that pain is a result of contact ceptor stimulation for the purpose of securing protective muscular activity.
Still, as the occasional craving does really arise in most men, it is well to notice it; and chiefly for the purpose of saying, that this dangerous feeling wears off by degrees; and oftentimes for long periods it intermits so entirely as to be even displaced by a profound disgust to all modes of artificial stimulation.
This sleep-walking had been suggested to you and you had brooded upon the suggestion until you were bound to respond. Graham's presence in your room, watching for just that reaction, was a perpetual, an unescapable stimulation. It would have been a miracle in itself if your brain had failed to carry it out." Bobby made a swift gesture of distaste.
It should not be used, except if specially indicated, in broken compensation or in other myocardial weakness. Iodids: These have no immediate action. The vasorelaxation that often occurs from iodid is quite likely due to the stimulation of the thyroid gland by the iodin, and the thyroid gland secretes a vasodilating substance.