. Cassier's magazine. amples, of the water to bothchemical and bacteriological analysesin order to test its suitability from asanitary point of view. Modernknowledge on the subject of watersupply requires that the results of thedifferent analyses should be taken to-gether, much stress being laid now-a-days upon the number and kind ofliving organisms or bacteria in thedrinking water. In addition to the tests mentioned,a sanitary inspection of the source ofsupply, or of the water shed or theriver basin and its tributaries, or of thelake and its water sources should bemade. In the case of running
. Cassier's magazine. amples, of the water to bothchemical and bacteriological analysesin order to test its suitability from asanitary point of view. Modernknowledge on the subject of watersupply requires that the results of thedifferent analyses should be taken to-gether, much stress being laid now-a-days upon the number and kind ofliving organisms or bacteria in thedrinking water. In addition to the tests mentioned,a sanitary inspection of the source ofsupply, or of the water shed or theriver basin and its tributaries, or of thelake and its water sources should bemade. In the case of running streams-it is considered insufficient merely to-take a sample of water at the placewhere it is intended to locate the inletto the pumps. It is very much betterto take additional samples above suchpoint and incidentally to determine byan inspection the character of thecountry in which the stream runs. Itwill be found in many cases that thewater course is made use of by settle^ THE WATER SUPPLY OF COUNTRY BUILDINGS 495. M FOR THE GRAVITY SUPPLY SYSTEM OF HOTEL JIT. WASHINGTON ments located upstream, as a conveni-ent outfall into which their sewers ordrains may empty. One must, there^fore, make sure of both the presentpurity of the supply and of its safetyfrom future pollution. A source of supply may be ever sofavourable as regards its quality, but ifthe quality available falls short of thevolume required, it may become nec-essary to look for other sources. Inthe case of small springs the quantityyielded can usually be readily meas-ured and small brooks or watercourses can be gauged by means ofweirs. For large and important build-ings it is necessary, when a supplyfrom wells is desired, to drive testwells and to ascertain the supply bymeans of pumping. In this way thequantity available is readily deter-mined, and the next step is to com-pare this with the quantity actuallyrequired. Right here it is well for the engi-neer to remember that the allowancein the case of country mansio
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