PLATE 2. 
Bacterial olive-knots produced on four plants by delicate needle-pricks. 
‘Inoculated January 4, 1904. Photographed May 16, 1904, nearly natural size. The organism came originally from an olive-knot obtained in 
California, where the disease has been very destructive for 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, 
