. The analysis of food and drugs . 80. Newt (Salamander). — The common newt may becomeparasitic to man through ingestion of the eggs, and as the MICROSCOPIC EXAMINATION 37 consequences are very grave, any water containing theseamphibia should be absolutely prohibited as drinking-water. Animal and Vegetable Debris. Fibres of clothing, such as linen (82), wool (83), silk (84),and cotton (85), may be found in polluted scales (86).Undigested muscular fibres (Ql).. 38 CHEMICAL AND BIOLOGICAL ANALYSIS OF WATER V. CHEMICAL EXAMINATION. Total Solids.—The amount of solid matter left o
. The analysis of food and drugs . 80. Newt (Salamander). — The common newt may becomeparasitic to man through ingestion of the eggs, and as the MICROSCOPIC EXAMINATION 37 consequences are very grave, any water containing theseamphibia should be absolutely prohibited as drinking-water. Animal and Vegetable Debris. Fibres of clothing, such as linen (82), wool (83), silk (84),and cotton (85), may be found in polluted scales (86).Undigested muscular fibres (Ql).. 38 CHEMICAL AND BIOLOGICAL ANALYSIS OF WATER V. CHEMICAL EXAMINATION. Total Solids.—The amount of solid matter left on theevaporation of a given quantity of water will naturally varylargely according to the geological character of the localityfrom which it has come. The total solids of a potablewater consist mainly of calcium carbonate, sodium chloride,small quantities of nitrate and sulphate of calcium, and alittle silica, together with any non-volatile organic mattersthat may be present. If it is not desired to ascertain what the total solidsconsist of, but merely to learn their amount, it will besufficient to work on 50 or 100 , which should beevaporated in a platinum dish. The dish must be cleanedwith very fine pumice powder till quite bright outside andin; and the evaporation may be begun over a low gas-flame,but must be finished over a water-bath. As a temperature of 100° C. is not sufficient to expel allmdisture, the dish should then be placed in an air-bathand heated up
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