This diagnostic eruption again points to another fact, viz. that the leprosy must have had its seat in a part of the body, the cutaneous glands of which stand in a relation of lively sympathy with those of the skin generally, and this according to modern experience can only be the cutaneous glands of the genital organs. Sometimes inoculation with cow-pox lymph brings out a general eruption of the whole skin, but this circumstance cannot well be made pertinent here, as really and truly the lymph is a resultant product of a feverish affection, and therefore its innate tendency is towards a reproduction of itself under circumstances of feverish stimulation, and to set the whole organism, and consequently the whole cutaneous glandular system, in a state of enhanced activity. How the diagnostic eruption comes about may be gathered from the statement of the case given just above; while the passage quoted from _von Roeser’s_ Work will explain the rest. Still for the present this much may suffice to put the expert reader in a position to test our conjecture,—for indeed so far it makes no profession to be more than a conjecture. Supposing it found tenable, then the further consequences that cannot but grow from it for the elucidation of the Chapter in discussion may be readily developed. On the other hand, if it is devoid of justification, it would be quite useless further to elaborate a hypothesis, plunging a subject obscure enough without this in even deeper darkness. Further than this we only need to mention that _Hensler_ and others hold _mentagra_ to be indicated in the bald chin and scurfy (scall) chin of Leviticus (XIII. 29 sqq.), which if they are right would merely be another point in favour of our view.
Finally there can hardly be any need for us to observe that we have no idea of holding leprosy in general to be a consequence of excesses; on the contrary we believe, to return to the problem we started with at the beginning of this Section, that we are bound to agree to the opinion first explicitly laid down by _Becket_[184], viz. _that under the widely comprehensive notion of Leprosy were included other forms of skin-diseases owing their existence to some previous affection of the genital organs_,—in precisely the same way as this happened in the Middle Ages, and as may be the case occasionally even at the present day.