1893.] The Organism of Leguminous Tubercles. 235 
Following close upon Vuillemin’s contribution were several 
by A. Prazmowski, a preliminary paper in 1888,7°% in which 
he considers the tubercles to be due to a parasitic fungus re- 
lated to Woronin’s Plasmodiophora brassice. 
A second paper appeared in 1889, *° and the final results of 
his study of the etiology and development of the tubercles 
was published in 1890.8! Prazmowski now believes the tu- 
bercles to be due to one of the bacteria and he describes the 
organism obtained by himself in artficial cultures from the 
tubercles. By inoculation with the same he succeeded in de- 
veloping the tubercles. According to him it is a bacterium. 
In artificial cultures it always develops in the form of simple 
short tods, which may for a time remain joined in short 
chains, but it never forms filaments. The rods may farther 
divide up into short cells, and it possesses a’ motile form. 
He denies the presence of fungus hyphe, regarding them as 
gelatinous tubes which the organisms excrete to form a pro- 
ses corering for the mass. The manner of infection 
ee at meet hairs agrees in all essential respects with 
‘: apy by Ward (Il. c.), only Prozmowski does not 
the i, e Seay as having any genetic connection with 
baer m, but simply encloses them while the colony of 
irected by a common purpose move along together 
wit - : 
h the advancing tube down into the tissue of the root. In 
regard to this unit 
described by Prazm 
as unable to demonstrate the membranous 
be, while there seems to be pretty good evi- 
€ experience of Eriksson, ** Ward,** Vuille- 
hature of the ty 
nce from th 
Ueber W, 
sya10, © ba ge pam der Leguminosen, Bot. Centralb. xxxvi (1886). 
Akad. d. Wj i znaczeuin kirsenion ch hi a d. Sitz. d& k ‘6 
Bedentr. seensch. i ych grochu. Berichte aus d. itz. d. k. 
tung der Worst rakau, June, 1889. D und die biologische 
: as Wesen 
a ollchen der Erbse. Bot. Centralb. xxxix (1889). 356- 
¢ Wur. 
Meechichte dor seo der Erbse; Erster Theil, Die AStiologie und Entwick- 
ol nollchen.  Landw. Versuchs-Stationen. xxxvit (1890). 
t z 
Wasa) 12. Myxobacteriacez, ane 
‘udier cof : ; 
(874i, 381. “er Leguminosernas rotkncelar. Lund. 1874. Bot. Zeit. XXXv. 
431 ~443. 
Trans, : 
See. xem (1889), Royal Society. crxxvin, (1887).. 539-562. Proceed. Royal 
w order of Schizomycetes. Bot. Gazette, xvi : 
3 
