5U ^ 



SCIENCE 



New Series TfRTnAV DRPRTWTtTi'T? S1 1 Q90 Sihgle Copies, 15 Crs. 



Annual Subsceiption, 86.00 



vol LirNo. 1357 Friday, December 31, 1920 



Smith's Bacterial Disd ps of Plants 



This book is the result of thirty-five years of readi'j % ^^^ diligent laboratory and 

 field investigation. More than most books it is tF % gi^-uct of experiment. It 

 is largely the product of a single laboratory, eight d *|^^ burteen organisms here 

 selected for special study having been named by the \ '^^- It is, in a sense, a 

 review of Professor Smith's work in this field. \ % 



That elaborate apparatus is not necessary for experimenta, %\ m plant bacteriology 

 is well illustrated in the simplicity of the apparatus Profe % ' lith uses in his own 

 research. re '%, ■ 



■.■a ^^ 



By Erwin F. Smith, in charge of Laboratory of Plant Pathology, Bureau \M - Industry, WashinstoD. 



B.C. Octayo of 600 pages, iUustrated. ■*^ Cloth, $10.00 net. 



Boyd's Preventive Medicine just out 



The aim of this new book is to present clearly yet concisely the salient features of 

 modern preventive medicine. Five groups of diseases are considered: Those 

 resulting from the invasion of micro-organisms; those resulting from faulty diet; 

 those the result of unhygienic or insanitary conditions of employment; those the 

 result of the puerperal state; and those transmitted from parent to ofispring. This 

 is a practical book. 



Octavo of 352 pages, with 135 illustrations. By Maek F. Bow, M.D., M.S , C.P.H., Professor of Bacteriol- 

 ogy and Preyentive Medicine, Medical Department of the Cniveisity of Texas. Cloth, $4.00 net. 



Boothby and Sandiford's Metabolic Rates 



This new work, the result of personal laboratory research, has chapters on basal 

 metabolism, calorimetry, post-absorptive conditions, muscular activity, respiration, 

 sleep, gasometer and accessory apparatus, Haldane gas analysis, solutions, calcula- 

 tions of basal metabolic rate, etc. 



By Walter M. Boothdy, M.D., and Irene Sandifosd, Ph.D., Section on Clinical Metabolism, Mayo 

 Clinic, Rochester, Minn. Octavo of 150 pages, illustrated. Cloth, $5.00 net. 



SIGN AND MAIL THIS OKDEB POBM TODAY 



W. B. SAUNDERS COMPANY,West Washington Sq.,PSiila. 



{Smith's Bacterial Diseases of Plants - $10.00 net") 

 Bayd'e PreTentiva Medicine - ... $4.00 net [■ and charge tO my aCCOUnt 

 Boothby and Sandif ard's Metabolic Rates $5.00 net j 



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