IMER AMEND - science.sciencemag.org · The source of illumination is a 14" daylight fluorescent bulb (for AConly) ... A SOURCE BOOK OF AGRICULTURAL CHEMIS-TRY, by C. A. BROWNE (U.S.D.A.).

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PRE-INCAIC HUAMACHUCOSurvey and Excavations in the

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BY THEODORE D. MCCOWNVolume 39, No. 4, pp. x + 223-400,

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A TEXT-BOOK OFORAL PATHOLOGYBy THOMAS J. HILL, D.D.S.

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This is an important contribution to preventivedentistry. It demonstrates what can be done tocontrol the common oral diseases such as dentalcaries, gingivitis, pyorrhea and the stomatides. Itdevelops the medico-dental relationship which ex-ists in present-day health service and which hasexpanded the subject beyond the technical pro-cedures. The experience and researches 6f theauthor, his rational attitude and the lucidity withwhich the subject is presented all help to make thisthe standard work in its subject.

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MAY 25, 1945 SCiENCE-ADVERTISEMENTS 3

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'4 ,SCIENCE..ADVBRTISEM.0N.TS 1VOL. 101 No. 2630

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SCIENCE-ADVERTISEMENTS VOL. 1017 No. 263010

SCIENCEVOL. 101 FRIDAY MAY 25, 1945 No. 2630

A Rational Examination of Stream Pollution Abate- DR. J. W. BEARD and OTHERS. Rooting Green-ment: RICHARD D. HOAK............................. ................ 523 wood Cuttings without Sunlight under Fluorescent

Obituary:Lamps: DR. V. T. STOUTEMYER, ALBERT W. CLOSE

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A RATIONAL EXAMINATION OF STREAM POLLUTIONABATEMENTBy RICHARD D. HOAK

MELLON INSTITUTE OF INDUSTRIAL RESEARCH, PITTSBURGH, PA.

STREAm pollution, from all sources combined, is anextremely complex problem which has expanded grad-ually, largely through non-recognition of its effects orindifference to them. If it is borne in mind that theamount of pollutive substances discharged to streamshas increased almost imperceptibly, in general, overmany years, it is not difficult to understand how suchpollution has become widespread before there has beena realization of its significance. As pollution abate-ment involves many conflicting factors it is desirable,from time to time, to re-examine the subject and con-sider its fundamentals. Numerous technical reports,treatises and results of surveys are in existence,couched in the language of the biologist, the chemistand the engineer. In this article an attempt will be

made to discuss some pertinent considerations in thefamiliar words of the layman.

STREAM FUNCTION

The geological plan of the earth offered streams tocarry away the waste products of natural processes.In conducting excess water from the land to the oceans,streams transport such a quantity of mineral andorganic wastes that many watercourses support butlittle aquatic life and their waters are unsuitable fordomestic or manufacturing uses without extensivetreatment. Streams vary widely from basin to basinin their normal burden of silt, dissolved substances,organic matter and microorganisms, and the restora-tion of streams to their natural state by the elimina-