1897.] The Bacterial Diseases of Plants : 37 
the disease spreads from the bulb upward. I would 
add, that the spread of the bacilli from the point of 
inoculation is very rapid. Ifa leaf15 to 20 cm. long 
is inoculated at its base outside of the bulb, the bacilli 
may be detected even after 24 hours, at a distance of 
5 to 10 em. in the leaf parenchyma.” 
(D) Apparently; in part, at least. Statements not very 
explicit. 
Conclusion.—Pathogenic nature clearly established. 
Note.—Lack of full proof under D seems to be atoned for by 
repetitions under B and C. 
2. Morphology : 
(1) Shape, size, etc—The organism is a conspicuous bacillus, 
with rounded ends. It is 4 to 6x1», and always single. 
Shorter rods occur; but direct observation shows these to be 
younger stages, which have resulted from division. The pro- 
cess of division is easily observed in hanging drops. 
(2) Capsule—No mention of any capsule. 
(3) Flagella.—Organism actively motile. Nothing concern- 
ing organs of motion. 
(4) Spores—No mention of any spores. 
(5)- Zooglæa.—“ Inoculated nutrient fluids become uniformly 
cloudy. I have not observed in them any local heaping-up of 
the bacilli.” 
(6) Involution Forms.—No mention of any involution ae, 
3. Biology : 
(1) Stains—No special peculiarities. The organism Se 
readily with all the ordinary stains. 
(2) Gelatin.—Organism grows well upon ordinary gelatin. — 
The surface colonies on plate cultures are circular, about 2 mm, 
in diameter, smooth and shining, not very prominent, bluish- 
white with a somewhat darker center, translucent. The buried 
colonies have an oval form, and are rather (ziemlich) pointed 
at the poles. They are yellowish-whiteand dull. The bacillus 
does not liquefy gelatin. 
(3) Agar.—Growth as on gelatin. There are no noteworthy 
differences either in plate or stab cultures. In stab cultures 
the bacillus grows uniformly the whole length of the stab, and 
