THE 

 SPIRIT OF THE SOIL 



OR 



AN ACCOUNT OF NITROGEN FIXATION 



IN THE SOIL BY BACTERIA AND OF 



THE PRODUCTION OF AUXIMONES IN 



BACTERIZED PEAT 



BY 



GORDON D. KNOX 



AUTHOR OF 

 "ALL ABOUT ENGINEERING," "ALL ABOUT ELECTRICITY," AND "ENGINEERING" 



WITH A FOREWORD 



BY 



PROFESSOR W. B. BOTTOMLEY 



' Semina vidi equidem multos medicare serentes 

 Et nitro prius et nigra perfundere amurca 

 Grandior ut fetus siliquis fallacibus esset." 



VIRGIL: Georgics, 1, 193-195 



S^CpND .IMPRESSION, . 



NEW YORK 



FREDERICK A. STOKES COMPANY 

 PUBLISHERS 



