1893.] The Organism of Leguminous Tubercles. 233 
and Wilfarth, °* and Laws and Gilbert®4 confirmed the inves- 
tigations of Ward, that the tubercles are due to the action of 
some organism within the soil. 
Ward pointed out that the relation of the low organism to 
its host was that of a symbiosis, with mutual benefit. Lund- 
streem®® entertains similar views, but left it undetermined 
whether the lower symbiont was a plasmodium or one of the 
bacteria. 
he tried to explain the entrance of the organism and its pass- ° 
*8¢ from cell to cell by stati meets 
in the cell Seals y stating that there were invisible pores 
In 1888 Vuillemin®7 
; : published his investi ations, the results 
Which, while Mainta . 
ining the relation of some symbiont in 
Pear to be quite at variance with others con- 
of the Organism. His studies of the de- 
ercles in the autumn. He observes the 
ts the enlargements as sporangia. 
claim: ce 4 pora 
sporangia oS observed the formation of zoospores in the 
: ese he describes as pyriform, with a cilium at 
"“Untersuc 
hungen jj ae . 
one, Beilage Ben liber die Stickstoffmahrung der Gramineen und Legumin- 
88 Reyieenelt 2. d. Zeitschr fq Ribenzucker Ind d.D. R. Berlin, Nov. 
gigs (op 
arches 2°. he nitrogen of vegetation, etc. 
azote de “asi --XXx. B. 1-107. Etat pb de la question des 
Z symbi “vegetation. Ann. Agr. xiv (1888), 
pol Papi = Bildungen bei den Pflanzen. Bot. Centralb. xxvii 
780-290, 797-804, cellchen, Bot. Zeit. 1888, p. 725-735, 741-750, 757-771, 
"Le 
tubercles +3: 
1888, p, fi Micaux des Léguminenses, Ann. d. Sci. Agr. Frang. et 
2 
