However, if the matter is looked into more closely, it will be evident that a large proportion of these scholars directed their attention to one single point only, viz. the antiquity and time of origin of the Disease; and regarded all the other factors only in so far as they supported one or other of the views they had formulated. Besides the co-ordination of these factors is seen to be so loose that no general result of any stringency could ever be obtained. The few men whose definite purpose it was to arrive at such a result, failed, in view of the difficulty of collecting the material, to reach the completeness they had proposed, and so deferred working up what they had accumulated till death put an end to their enterprise. In especial this was the case with _Hensler_, and the non-appearance of the Second Part of his History of the Venereal Disease must doubtless long continue to be mourned as an irreparable loss.
The Past, on which all experience must draw, affords us so little assistance here that it is to the Future we must look for everything. The Present cannot show us in existence any history of Venereal disease as we understand it, but this in no way entitles it to deny the possibility of such a History. Thus it is of the highest importance to make the attempt to arrange and sift the material now ready and accessible, so far as it concerns the Venereal Disease, on principles conformable to the Conception and proper Contents as indicated above of the History of a Disease, and for this a relative completeness of the collected materials suffices. If in this way we are successful in sketching the history of Venereal Disease at any rate in its general outlines, it can quite well be left to the continued efforts of other Investigators to fill in the individual lines of the picture, especially as then and then only is the particular point ascertained by anticipation, at which later accessions must be worked in.
In every History, what comes first and foremost is to get to know the original Authorities from which the material for its treatment can be drawn, and this forms the proper Contents of the _Literary_ history of the Disease. Accordingly our first duty will be to give a general survey of the literary helps lying ready to hand for the use of the Historian of Venereal Disease, and at the same time to specify how far these were accessible to ourselves. Thus the reader will be enabled at the very outset to form a judgement as to the completeness of the information supplied; and succeeding Enquirers will learn the gaps that are left remaining for them to fill up.
