PLATE 2. 



Bacterial olive-knots produced on four plants by delicate needle-pricks. 



Inoculated January 4. 1904. Photographed May 16. 1 904. nearly natural size. The organism came originally from an olive-knol obtained in 

 California, where the disease has been very destructive lor a number of years. A pure culture obtained from one of the California knots was 

 inoculated into young growing olive-shoots and numerous knots resulted. From one of these, after about three months, the organism was plated 

 out and a subculture from one of the colonies was used to produce the knots here shown. 



