Bui, 213, Bureau of Plant lidust-y, U. S. Dept, of Agriculture. 



Plate XVII 



Hairy-root of apple on sugar beet: (1,2) From one series oi inoculations: the normal 

 lateral roots are shown at X, x; inoculated Dec. 22. 1908. Time: 3 months 19 days. (3) 

 Enlarged from another series; inoculated Nov. 11, 1909. Time: 4 months 27 days. 



