To give an example of what can be done in Shanghai under expert engineers, the well of a local institu~ tion in the Central District should mentioned. Not only does this well supply hundreds of employees with pure drinking water, but through its capacity of 650 gallons: a minute, water can be provided for all necessary purposes in one fof the largest in the Bund. Its depth bord and the water is by means of air compress sors, 8 favoured method locally where, according to tests, the water has been shown to rise to six or even feet beneath the ground line. An underground tank at the sell questi has a capacity of 20,000 and seven mall roof tanks hold 2,000 gallons.
Daring the passes through a filter to eliminate any particles of sand generally released by the pressors, Chlorination of the water in the surface tanks is practised as a precaution simply from the possibility of germs having collected the regularly cleaned roof reser-
On. test the water from this artesian well is found to contain the
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