Insanity: Its Causes and Prevention

by Henry Putnam Stearns

II. So far, it will be observed, we have referred only to the indirect effect of alcohol upon the brain, which results from its influence upon the heart-action. I wish now to refer, in a few words, to its direct physiological effect upon the mind, when used as a beverage. Its primary effect is to cause a more rapid flow of thought. It is, as if that portion of a watch which holds its spring and prevents its too rapid uncoiling should be removed; the result would be a quickening of movement, and its power of action would be greatly increased for a little time. So it is with the mind under the primary influence of alcohol; as the blood flows through the brain more freely, thought becomes more accelerated, and there is an excitement of utterance and imagination. This period, however, soon passes by, and before long the mind becomes less clear and accurate in its perceptions; it is partially clouded; it loses the nicety of its moral sense; it does not perceive the moral side of conduct so clearly and definitely as formerly; it does not judge so accurately in reference to the claims of friends and society; and there is not that sense of propriety as to personal conduct which formerly existed. Moreover, the rapidity of impressions becomes lessened, and consecutiveness of thought is impaired, so that the mind fails to carry through a train of thought, or conduct a course of reasoning, as it would do when free from the influence of alcohol. This effect may continue under the repeated influences of alcohol until impressions, both objective and subjective, become less and less vivid and more circumscribed, and ultimately there may result partial paralysis of the power of thought. It becomes more and more liable to irregularity, confusion and weakness; the will loses its power of control in a large degree over mental operations, and insanity in some of its forms not infrequently ensues.

III. There is reason to believe that there results a further action of alcohol upon the electrical currents of the body, which originate in and proceed from the brain. Dr. Mulvaney, Staff Surgeon of the Royal Navy of England, conducted some experiments upon the effects of alcohol on these electrical currents, with the following results: “He discovered that an ounce of brandy, equal to about half an ounce of alcohol, taken by a healthy man, raised the galvanometer in a few minutes, in one case twenty-five degrees, and in another case forty-five degrees. He concluded that the thermo-electric currents of the system were strongly excited by small doses of alcohol, and that this excitement may be profitably employed when there is ‘clear evidence of derangement of function springing from enfeeblement of the organic system of nerves’; but that ‘in health, when function, nutrition, and blood and nerve influence are harmonized by structural integrity,’ such artificially excited currents, by tending to abstract an undue amount of water from the brain-cells, ‘must interfere with their normal working.’”[17]

It appears, then, that there are three well-recognized and clearly pronounced effects upon the elements of brain-structure which must result from the use of alcohol even in small doses. It will be observed that nothing has been said as to its physiological effects upon membranes in other portions of the body. I hardly need enter upon this branch of the subject in order to establish proof of its very great effect as an agent in producing a changed and unstable condition of brain-action. And yet we need to bear in mind how greatly its effects on the nervous system in general are increased by its affinity for water; and how it absorbs this from all portions of the body with which it may come in contact, thus tending to leave them in a shrivelled and dry condition,—one unfavorable to discharge of function.

That this may be more clearly understood in relation to the membranes of other portions of the system, as well as those of the brain, I quote from Dr. Richardson[18] a few sentences:

“Upon all these membraneous structures alcohol exerts a direct perverting power of action. It produces in them a thickening, a shrinking, and an inactivity that reduces their functional power. That they may work rapidly and equally, the membranes require to be at all times properly charged with water. If into contact with them any agent is brought that deprives them of water, then is their work interfered with; they cease to separate the saline constituents correctly; and if the evil that is thus started be allowed to continue, they contract upon their contained matter, in whatever organ it may be situated, and condense it.

“By its effects upon these membranes, envelopes, and coverings, alcohol becomes one of the most extreme causes of modification of animal function, and one of the greatest sources of structural degeneration.”

In the consideration of the subject as above, reference has been made to the effect of alcohol upon the adult system. But there can be no question that it is vastly greater and more ruinous in its effects upon the brain, when used during the period of youth and early manhood. At this time, the whole system is much more susceptible to unfavorable influences of all kinds, and especially is this the case with the brain, and that portion of it which is concerned in mentality.

The more highly sensitive and delicately organized any portion, or the substance of any part of the system may be, the more easily and rapidly are impressions and changes of a permanent character made upon it. The brain, being more highly organized than any other organ or portion of the body, and the metamorphosis of its tissues being more rapid during the earlier periods of life, becomes greatly more susceptible to the bad effects of alcohol, and a diathesis is more rapidly created. And, it may be added, that, when this diathesis has once become developed during early life, there exists almost no hope of eradicating it, or of again rendering the brain healthy.

Improvement may take place while abstinence from alcohol continues and the person is under restraint, but when once again the unfortunate victim is thrown upon his own resources, and left to his self-control, he always falls, and returns again to his cups, as a sow to her wallowing in the mire.

In the preceding chapter upon Heredity in its relation to the Insane Diathesis, it was shown that the effects of alcohol are such, that they are most surely transmitted from parent to child; and that its effects, both moral and physical, are of the most serious character.