Now when even in our temperate climate the cutaneous glands play a not unimportant part in the morbid processes of Venereal disease, how much more must this be the case in Asia and Egypt, where the activity of the skin generally and that of the cutaneous glands in particular is even under normal conditions far more conspicuously energetic, as may be seen from the constant oily state of the skin, more particularly in Negroes. This oily grease on the skin is in fact nothing more nor less than the product of the action of the cutaneous glands. These glands are peculiarly apt to become morbidly affected in travellers visiting the South during their acclimatisation; though natives too are yearly attacked in the Summer months by complaints of the skin-glands.[170] The fact has long been recognized[171] that in Southern countries not only the greater number of skin-diseases, but even Venereal disease itself in an especial degree, appear as an exanthema of the skin, and for this reason it there displays far less destructive effects; but as a rule enquirers have contented themselves with the general habit, without (as pointed out before) adequately turning the fact to advantage in connection with the History and Theory of Venereal disease. This preponderating bias towards the external skin must obviously manifest itself equally in other diseases of the mucous membranes, and so too in those of the genital organs. Reabsorption in particular, acting with increased vigour on the mucous surfaces, will prove its beneficial presence also in the diseases affecting them. The foreign matter that comes in contact with these surfaces is assimilated to a less degree by the mucous glands and by those of the _glans penis_, and no time is allowed it to exert a destructive influence on the small surface receiving it; on the other hand it is quickly thrown back on the much more extensive surface of the external skin, and there dealt with by the cutaneous glands with their powerful secretive and assimilatory action, being either assimilated or expelled externally.