Unfortunately, even in our temperate zones it has become a hazardous thing to drink water, as was evidenced in an article published as long ago as 19 April 1964, in the journal Nationalzei-tung (No. 178), entitled ‘Carcinogenic Substances in Water’. The article discussed the results of analytical tests of the water in Lake Constance and its catchment area. According to the author, the results indicated that the water analysed contained considerable amounts of carcinogenic substances. Even though the author did not sufficiently exploit the material, his presentation of the findings was enough to make us take note. We must remember that many toxins, besides the effluents from industries, can enter rivers and lakes without our realising it. For example, quite a number of poisonous sprays are used in agriculture, and deposits of leaded petrol and diesel oil accumulate on the roads. Rain and the water from melted snow take up these and many other substances, eventually washing them into the rivers and lakes. Tests have also shown that the groundwater in certain places already contains certain amounts of such pollutants, none of which are at all conducive to good health.
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