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Exterior human symmetry is surely a curious physiological fact where there is no symmetry interiorly. For the centres of life and movement within the body are placed with Oriental inequality. Man is Greek without and Japanese within. But the absolute symmetry of the skeleton and of the beauty and life that cover it is accurately a principle.

If, however, there be no real difference between the methods of science and those of common life, it would seem, on the face of the matter, highly improbable that there should be any difference between the methods of the different sciences; nevertheless, it is constantly taken for granted that there is a very wide difference between the Physiological and other sciences in point of method.

Hygiene deals with the laws by the observance of which health is to be maintained and disease prevented; but as such laws must be based on physiological principles, hygiene follows from physiology.

"I can see as well sitting or kneeling as I can standing," he remarked to Private Augustus Grobble. "It is a great physiological truth," replied Augustus, and they both sat down, leaning against each other for warmth and support, back to back. The soul of Augustus was filled with a melancholy sadness and a gentle woe.

Variations, in other words, the differences between individual plants and animals, however originated, are evidently not from without but from within not physical but physiological. We cannot here assign particularly the reasons for this opinion. But we notice that the way in which varieties make their appearance strongly suggests it.

Filehne, of Erlangen, who has studied a large number of these pyridine and quinoline derivatives, found, moreover, that the hydrochlorate of ethyl-piperidine had a physiological action quite analogous to that of conine.

I cannot promise to do more than to select a few of the points of contact between our ignorance and our knowledge which present particular interest in the existing state of our physiological acquisitions. Some of them involve the microscopic discoveries of which I have been speaking, some belong to the domain of chemistry, and some have relations with other departments of physical science.

It is enough to say here, without entering into the explanation of the fact, which will be found simple enough as seen by the light of modern physiological science, that the "nervous disturbance" which the presence of a woman in the flower of her age produced in my system was a sense of impending death, sudden, overwhelming, unconquerable, appalling.

If it be her sovereign will and pleasure to enact all sorts of physiological absurdities in the premises, who shall say her nay?

Add this stimulation, and the incongruity returns. Had such a shock never been felt, we should not know what incongruity meant; no more than without eyes we should know the meaning of blue or yellow. In saying this, we are not really leaning upon physiological theory.