Aids to tropical hygieneBaillière, 1922 - 240 страница |
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acid amount animals anophelines apparatus bacteria bites bleaching powder blood body boiling bulb carbonic carbonic acid carriers cause cells cent cheese chemical chlorine cholera climates clothing colour consists contains cool cresol cubic centimetre cubic feet destroy diet digestion disease disinfection dust effect eggs enteric fever especially excreta female fever filter filtration fleas flies formalin gallons heat houses humidity impure inches incineration India infected kala-azar labium larva larvæ larvicide latrine Leishmania lice lime macronucleus malaria material measures mercury method milk moisture mosquito native ordinary organisms ounces parasites poisonous pollution prevent proboscis produce protection protein quantity quinine rain rats relapsing fever rice roof sanitary season sewage skin soil solution steam substances sulphur surface tank temperature tertian tion tropics trypanosomes usually vapour varieties vegetable ventilation vitamin walls washed whilst winds
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Страница 205 - When the atmospherical pressure rises above the amount which was recorded when the instrument was made, the top is forced inwards, and vice versa, when pressure falls below that amount, the top is pulled outwards by the spring.
Страница 205 - In the aneroid, atmospherical pressure is measured by its effect in altering the shape of a small, hermetically sealed, metallic box, from which almost all the air has been withdrawn, and which is kept from collapsing by a spring.
Страница 30 - ... animal contamination is strongest in the case of spring and deep well water ; but this evidence may, in the case of these waters, be safely disregarded. And, thirdly, that as to hardness, rain water and upland surface water are on the average very much softer than spring and deep well water. " 10. In respect of wholesomeness, palatability and general fitness for drinking and cooking, our researches lead us to the following classification of waters in the order of their excellence, and founded...
Страница 109 - It breeds in manure and dooryard filth and is found in nearly all parts of the world. On account of the conformation of its mouth parts, the house fly...
Страница 177 - ... its penetrating powers are far greater. By ' saturated steam ' is meant steam at the temperature at which it condenses, and the temperature of the condensation point rises as the pressure increases. By ' superheated steam ' is meant steam at a temperature higher than that at which it can condense : therefore superheated steam has to be cooled down into the state of saturated steam before condensation ensues. If superheated, steam is used for disinfection, it loses heat by conduction, and the...
Страница 83 - The colour of articles should be carefully considered when deciding the question of general suitability. It is well known that different colours possess, in varying degrees, the power of absorbing heat. Black has the highest capacity for absorption — white has the least — the order in which different colours absorb heat being as follows : — Black, dark blue, light blue, dark green, turkey red, light green, dark yellow, pale straw and white. Under the name of " solaro," a cloth is now sold,...
Страница 69 - The starch has the further advantage of being present in small and easily digested grains. When boiled, rice swells up and absorbs nearly five times its weight of water, while some of its mineral constituents are lost by solution. It is preferable, therefore, to cook it by steaming.
Страница 3 - ... occurrence for many years. Temperature. The sun is always well up in the sky. The length of day and night varies little. Hence the mean temperature is high, it is very uniform over the whole zone, and there is little variation during the year. The mean annual isotherm of 68° is a rational limit at the polar margins of the zone, and the mean annual isotherm of 80° encloses the greater portion of the land areas, as well as much of the tropical oceans. The isotherms are thus far apart. The warmest...
Страница 5 - They have long been favourite sailing routes, because of the infrequency of storms, the brightness of their skies, and the freshness of the air, all of which are in pleasant contrast with the muggy and oppressive calms of the equatorial belt. These winds, called in the rainy season the " monsoons," control the seasonal change of tropical lands.