6 Contents 



PAGE 



Part III. Influence of various media on the infecting power and the 



vitality of Bacillus radicicola 32 



Experiment 10. Influence of clay, loam, sand, and carborundum 39 

 Experiment 11. Influence of hydrochloric acid, sodium hy- 

 droxide, and cane sugar, in varying concentrations 41 



Experiment 12. Influence of some other media : . . 47 



Experiment 13. Influence of media 300, 310, 335, and 400 68 



Summary 73 



General discussion. . 75 



Acknowledgments 78 



Bibliography 79 



