PLATE 2. 



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



I I .-^ I n„,rv4 1904 Photographed May 16. 1 904, nearly natural size. The organism came originally from an olive-knot obtained in 

 inocma tea ja y .^ ^^^ ^^^ ^^^ ^^ ^^^ destructive for a number of years. A pure culture obtained (rom one of the California knob was 



i;;«:ul3'into young growing olive-shoots and numerous knots resulted. From one of these, after about three month,, the orgamsm was plated 



out and a subculture from one of the colonies was U!«l to produce the knots here shown. 



