These different points once successfully and in a competent manner co-ordinated into a kind of organic connexion, the resulting History of Disease, a clinical History, yet as wide as humanity itself, will supply the most momentous factor towards an insight into the nature and essence of Disease. It will not merely afford the theoretical enquirer the necessary materials for his speculations as to Disease in general and systems of treatment, but also teach the practical Physician the conditions of a rational method of Therapeutics; and will consequently be equally interesting, and what is more, equally needful to both. Such an organic connexion can only be established on the condition that the Historian calls to remembrance step by step, as he proceeds, the sciences of Physiology and Pathology. Only by their help is it possible always and everywhere to mark the inner necessity of the relation of cause and effect and to distinguish the essential from the accidental.
Possibility of the History of a Disease in General and of Venereal Disease in Particular.
Having learned the Conception and proper Contents of the History of a Disease, we naturally proceed to another closely connected question,—do all Diseases admit of such a historical exposition? It may be taken for granted at the outset with tolerable certainty that the answer to this question will be affirmative for the majority of actual Diseases; at any rate hardly an objection can be alleged from the theoretical stand-point. At the same time practical Experience must be allowed a voice on this point.
Unhappily we gain but little that is comforting from experience. It can scarcely be said that even a beginning has been made so far towards writing the History of a Disease in the indicated sense; and besides this, diseases have been primarily selected for consideration in which the historical factor obtrudes itself, as it were, on the attention, to wit the epidemic diseases. For the rest hardly anything at all has been done, excepting only in the case of Leprosy and the Venereal Disease, for which with singular unanimity an epidemic character has always been claimed. The Proteus-like character of these Maladies hindered every attempt of speculation to penetrate their nature, and so enquirers saw themselves forced to consult History. But the merest superficial glance at the treatment of Venereal disease by its Historians (and this applies equally to Leprosy) will show that little more than an insufficient collection of materials towards an actual History of the disease has thus far seen the light; and this in spite of the fact that no contemptible number of the most distinguished Scholars have devoted time and trouble to the subject, in many cases making it their life’s work.