The Soil and the Microbe. By Professors Sel- 

 mnn A. Waksman and Robert L. Starke v pp xi 

 + 260. $3 50. 1931. John Wiley and Sons. Inc. 



When one recalls that our knowledge of the 

 role of microoro-anisms in soil processes and plant 

 growth has fleveloped chiefly in the past hnlf 

 century, it is remarkable how' large a bodv of in- 

 formation has already Ijeen accumulated. And 

 mncli of the most significant of this Dr. Waksman 

 and Dr. Starkey marshall briefly in lan inter- 

 esting and instructive manner in "The Soil and 

 the Microscope", so that the reader obtains a 

 vivid picture not only of soil organisms and their 

 multitudinous physiological reactions, but also of 

 the relation of these processes to the origin and 

 development of soils, to the cycle of the elements 

 in nature, and to plant nutrit'on. Tlie present 

 volume affords an excellent introduction to the 

 somewhat encyclcpnedic "Principles of Soil 

 Microbiography" by the senior author, a world 

 n.uthoritv in the field. — L. L. Woodruff. 



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