Climate and Health in Hot Countries and the Outlines of Tropical Climatology / A Popular Treatise on Personal Hygiene in the Hotter Parts of the World, and on the Climates That Will Be Met Within Them.

by George Michael James Giles

The occasional fumigation of a dwelling in this way is a useful adjunct to the destruction of the larvæ; and where combined with proper [wire-gauze protection], after the plan described below, may be relied upon to secure immunity from the attacks of insects, even where measures for the destruction of larvæ are impracticable. It has the further advantage that it is fatal not only to mosquitoes, but also to insect pests of all sorts, such as flies, hornets, bugs, or fleas, and even to such more awesome foes as scorpions and centipedes, all of which delight to share the home of the dweller in tropical climes.

Mosquitoes are always greatly attracted by draperies, especially those of dark colour, and the fact may be utilised to trap them by means of deep bags of black gauze (chiffon), the mouths of which are held open by an oval loop of cane, or some such material. Such bags, if hung up mouth down-wards in tempting dark corners, will usually be found swarming with mosquitoes each morning, and the insects can easily be killed by crumpling the bag in the hands and then shaking out the dead insects.

By working on the above lines, especially where one has the co-operation of neighbours, it is in all cases quite possible to materially diminish the nuisance of mosquitoes, and under favourable circumstances to practically extirpate them; though, in a usual way, complete success must not be expected. In the exceptional cases where this is possible, there is, of course, no need for the adoption of any other sort of measures; but, in the majority of cases, an amelioration only in the numbers of insects is all that can be attained; and it is necessary to guard against the risk of some of the survivors becoming infected, by the adoption of measures of the second and third classes. Of these the second, i.e., the protection of man from mosquito bites, is in most cases the most easily practicable.

A variety of ointments and applications of various sorts have been from time to time vaunted as protectives, and the presence of certain plants, such as the eucalyptus and the castor-oil shrub, have also been stated to be so obnoxious to mosquitoes of all sorts that they might be trusted to make themselves scarce wherever these plants might be found. For these ideas there is doubtless this much foundation in fact, that most strongly smelling bodies really are obnoxious to mosquitoes; but unfortunately, whatever objection they may have to strong scent is not very deeply rooted, and in default of more congenial shelter they will settle upon either eucalyptus or castor-oil plants, and will brave even the hated smell of paraffin to secure a good feed on the blood of a human or animal subject. All these special applications to the skin, too, have the further disadvantage that, though some of them are fairly effectual for a few minutes after they have been just applied, and so enable the user to get sleep, they leave those who are deluded into depending upon them to fall unresisting victims, as soon as the thick of the scent has evaporated. So that, though valuable for securing rest, they are worse than useless from the point of view of the prevention of malaria. With these untrustworthy exceptions, all available measures are of a mechanical character, and consist in modifications of our housing and clothing.

It must be remembered that during the working hours of the day there is little chance of being attacked, at any rate in the open air, and the same is the case in well-lighted rooms. Thus men whose work takes them into the open air for some considerable portion of the day, or are occupied in well-lighted offices, run much less risk than ladies, who, when they attempt to face the hot weather at all, are too fond of shutting themselves up in a darkened room, devoid of light or fresh air, and filled up with hangings and other superfluities, so as to form a perfect mosquito paradise in which the insects can fly about and bite during the day as comfortably as during the night. With such exceptions, there is therefore no need to modify costume to diminish the chance of mosquito bites as long as the sun is up, or even during the twilight, as long as one is in motion. It is when people are resting after the evening game of golf, racquets, or tennis, that they are most commonly attacked while awake; but the time of greatest danger is the period passed in sleep. During the waking hours it is uncommon for a mosquito to get the chance of an undisturbed meal by attacking the face and hands, but she often does so by attacking the ankles, and even thick stockings are no adequate protection. Trousers are therefore more suitable than knickerbockers for evening wear, and should be made extra long; so that when turned down after taking one’s evening exercise, they thoroughly protect this very vulnerable portion of the person. A lady can generally arrange her dress so as to protect herself, but the ordinary costume of children is extremely dangerous, and certainly should be modified to meet this danger during the hours when mosquitoes are active. In the case of little boys a “sailor suit” with long voluminous trousers meets the difficulty; and—fashion or no fashion—it is a clear duty on the part of mothers to devise some cool but adequate protection for the little girls. The alternative lies between doing so and wilfully offering them as sacrifices to the god of dress by needlessly exposing them to the danger of infection.

The low-necked, sleeveless dresses worn by ladies in the evening must, we can well understand, be very temptingly cool wear in the climates with which we are dealing, but are obviously extremely dangerous, as they leave a large surface of the person exposed at the very time when mosquitoes are most active. A dress covering these parts should be therefore substituted, which, however, may safely be made of the lightest materials, provided that it be so puffed or otherwise “confectioned” as to make it difficult for a mosquito to get within reach of the skin. Mosquitoes are always fond of collecting under tables, as they are there sheltered from the glare of the lamps, and on this account it is advisable for men to wear straps to their trousers when dressing for dinner; and though the plan is a very old-fashioned one, I have some hope that the suggestion may meet the approval of our better halves, as, whatever its real object, the adoption of the plan certainly gives the wearer the air of having sacrificed comfort to appearances.

There would, however, be no need of modifying costume for indoor wear in any way were houses properly protected against the entrance of mosquitoes by means of suitably planned wire-gauze protection to all openings.

The plan in question was devised by Professor A. Celli, the Principal of the Institute of Hygiene in the University of Rome, and in Italy at least has long passed its experimental stage; though, owing probably to the small number of Englishmen who are familiar with the Italian language, it appears to be practically ignored even by our specialists on the subject.

Within a few miles of the great city of Rome there are large areas where malaria, far more virulent than the type of disease we usually meet with in India, is so rife that, during the malarious months, the country is practically deserted by all but a few necessary railway officials and caretakers. Amongst the former the mortality and invaliding used to be so heavy that the working of the lines was a matter of the greatest difficulty.

The majority of the peasantry, being only temporary inhabitants, live in grass huts not a whit in advance of those of the savages of Central Africa, and from the migratory nature of their employment, are among the most ignorant and backward of the Italian populace, and so about the last people likely to lend themselves to the adoption of any “new-fangled” custom. As a matter of fact, however, the object lesson of the advantages of the system have been so obvious that, after the first year, there has been no difficulty in securing the eager co-operation of the simple railway men and scarce civilised farm hands. As the system is necessarily being very gradually introduced, there are plenty of unprotected houses for comparison, and after personally conversing with the inhabitants, the writer found that all who had enjoyed the benefits of the plan were convinced of its efficacy.