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THE AMERICAN JOURNAL OF SOCIOLOGY
interesting, as they show that, concomitant with a three-fold increase of population in the years 1873-1902, there has been a fifteen-fold increase in the use of water. The necessity for water for manufacturing purposes, for increased domestic use, and for municipal use, is increasing as time progresses.
HOWARD WOODHEAD.
BERLIN, GERMANY.
\To be continued^
