Independently of the utility of the study, what a world of delight is open to the mind of that man who has devoted some portion of his time to the investigation of his mental organization! In him we may truly behold—
“Nature, gentle, kind,
By culture tamed, by liberty refreshed,
And all the radiant fruits of truth matured.”
When we take into consideration the tremendous influence which the different mental emotions have over the bodily functions, when we perceive that violent excitement of mind will not only give rise to serious functional disorder, but actual organic disease, leading to the commission of suicide, how necessary does it appear that he to whose care is entrusted the lives of his fellow-creatures, should have made this department of philosophy a matter of serious consideration! It is no logical argument against the study of mental science, to urge that we are in total ignorance of the nature or constitution of the human understanding. We know nothing of the nature of objects which are cognizable to sense, and which can be submitted to actual experiment, and yet we are not deterred from the investigation of their properties and mutual influences. The passions are to be considered, in a medical point of view, as a part of our constitution. They stimulate or depress the mind, as food and drink do the body. Employed occasionally, and in moderation, both may be of use to us, and are given to us by nature for this purpose; but when urged to excess, the system is thrown off its balance, and disease is the result.
To the medical philosopher, nothing can be more deeply interesting than to trace the reciprocity of action existing between different mental conditions, and affections of particular organs. Thus the passion of fear, when excited, has a sensible influence on the action of the heart; and when the disease of this organ takes place independently of any mental agitation, the passion of fear is powerfully roused. Anger affects the liver and confines the bowels, and frequently gives rise to an attack of jaundice; and in hepatic and intestinal disease, how irritable the temper is!
Hope, or the anticipation of pleasure, affects the respiration; and how often do we see patients, in the last stage of pulmonary disease, entertaining sanguine expectations of recovery to the very last!
As the passions exercise so despotic a tyranny over the physical economy, it is natural to expect that the crime of suicide should often be traced to the influence of mental causes. In many cases, it is difficult to discover whether the brain, the seat of the passions, be primarily or secondarily affected. Often the cause of irritation is situated at some distance from the cerebral organ; but when the fountain-head of the nervous system becomes deranged, it will react on the bodily functions, and produce serious disease long after the original cause of excitement is removed. It is not our intention to attempt to explain the modus operandi of mental causes in the production of the suicidal disposition. That such effects result from an undue excitement of the mind cannot for one moment be questioned. Independently of mental perturbation giving rise to maniacal suicide, there are certain conditions of mind, dependent upon acquired or hereditary disposition, or arising from a defective expansion of the intellectual faculties, which originate the desire for self-destruction. These states will all be alluded to in the course of the present inquiry.
Some idea of the influence of certain mental states on the body will be obtained by an examination of the various tables which have been published, in this and other countries, respecting the causes of suicide, as far as they could be ascertained.