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Updated: May 12, 2025
This, however, is by no means all that is comprehended in the education that prepares for direct self-preservation. Besides guarding the body against mechanical damage or destruction, it has to be guarded against injury from other causes against the disease and death that follow breaches of physiologic law.
Numerous experiments on animals to determine the effect of ether anesthesia per se, i. e., ether anesthesia without trauma, showed that, although certain changes were produced, these included neither the physiologic exhaustion nor the alterations in the brain-cells which are characteristic of the effects of trauma.
It will, however, be necessary to return thereto, touching upon it in another part of this essay. There remains a problem, so obscure and enigmatic that I scarcely venture to approach it, in the analogy that most languages the spontaneous expression of a common thought establish between physiologic and psychic creation.
The extreme application of the principle would no doubt disturb the limits between many species and varieties as now recognized. It is not to be forgotten however that all taxonomic distinctions, which have not been confirmed by physiologic tests are only provisional, a view acknowledged by the best systematists.
Varietal differences in a physiologic sense they do not possess, and for this reason afford a pure instance of unbalanced union, though differing in more than one point. I have made reciprocal crosses, taking at one time the small-flowered and at the other the common species as pistillate parent.
These fall under two heads, the exigencies of practice, and the physiologic laws of variability. Of course, only the latter heading comes within the limits of our discussion which includes two main points.
The following are the principal points presented: In operations under inhalation anesthesia the nerve impulses from the trauma reach every part of the brain the cerebrum that is apparently anesthetized as well as the medulla that is known to remain awake the proof being the PHYSIOLOGIC exhaustion of and the PATHOLOGIC change in the nerve-cells.
The instances of feats of agility and endurance are in every sense of the word examples of physiologic and functional anomalies, and have in all times excited the interest and investigation of capable physicians.
In hyperthyroidism at first the blood pressure may be lowered on account of the increased physiologic secretion of the thyroid gland. Later the blood pressure may be raised by stimulation of the suprarenals, or it may become raised from the irritated and stimulated heart becoming hypertrophied.
Only the very rare occurrence of instances of atavism in varieties that are for the rest known to be absolutely constant, is to be considered. Atavism or reversion is the falling back to a prototype. But what is a prototype? We may take the word in a physiologic or in a systematic sense.
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