In the matter of water supply, it should be needless to point out that its sources are always necessarily of doubtful purity, and that more than common care is therefore essential to secure that it is properly sterilised by boiling. As already remarked, it is a good plan, where possible, to send on and get the wells in advance disinfected by treatment with permanganate of potash, and this precaution is, of course, especially important in the presence of cholera.
In the sort of camp life under consideration, regular camp beds are assumed to be carried, so that there is no need to burden oneself with heavy ground sheets, ordinary cotton carpets being, for our purposes, far more comfortable and sightly; but it is nevertheless well, wherever the material is available, to lay down, beneath the floorcloth, a good layer of hay or straw, as this not only serves as a sop to the white ants, but serves the further sanitary purpose of taking up the damp that is always arising from the soil even in apparently very dry localities. As the litter is in no way damaged by its use for this purpose it is rarely necessary to buy it outright, the owners being usually satisfied with a trifle for the loan of it, sufficient to remunerate them for the trouble of bringing the straw and fetching it back. In standing camps however, litter used for this purpose should always be cleared out and dried in the sun at frequent intervals, as without this precaution it is sure to get mildewed and offensive.
There is, of course, no real difference between the rules of personal hygiene suitable to camp life, and those of dwellers in more settled habitations, and with due attention to a few special points such as those that have been touched upon in the present article, camp life, on account of the constant enjoyment of fresh air which it affords, will always be found far healthier than that passed within houses.
“Fever,” _i.e._, malaria, is responsible for so large a share of the sickness peculiar to tropical countries that the subject of its prevention requires especial and separate consideration. Up to a few years ago the causation of malaria was a complete mystery. We had known for some score of years or more that the disease was due to the presence of certain minute animalcules in the blood, but as to how they got there, or the manner in which they passed from man to man, we had not the remotest idea. There was a general opinion that the seeds of the disease were carried by the air in the form of what was pretentiously spoken of as a miasma--a formidable word which served well enough to hide from the profane vulgar the fact that no one could define, or in fact had the vaguest notion as to what a miasma might be. It was also popularly known in many parts of the world that miasmata found great difficulty in getting through a mosquito net; but by the majority of the profession these traditions were looked upon as laic fables, unworthy of scientific attention, though there were not wanting observant practitioners of tropical medicine who were willing to admit the efficacy of the protection afforded by a mosquito net, and who even attempted to account for the fact by all sorts of lame physical explanations, barring only the simple one that a mosquito net serves very fairly the purpose for which it is designed, viz., of keeping out mosquitoes. The condensed moisture of the dew on the fluff of the meshes in some way attracting the germs or dissolving some assumedly gaseous emanation, was a favourite so-called explanation, and was, I believe, that adopted by the late Prof. Maclean, of Netley, who in his lectures was always careful to impress upon us the protection afforded by mosquito nets, as a well-established, though ill-understood, fact.