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similar conclusions. His pupil Schlicht has found fungi in roots 
of the following families. Ranunculacee, Leguminose, Rosacez, 
(Enotheracee, Umbelifere, Geraniaceze, Oxalide, Hypericacee, 
Violacee, Primulacez, Labiatz, Boraginez, Dipsacez, Valerian- 
acee, Plantaginee, Rubiaceze, Smilacez, Composite, Graminez. 
The true nature of the RAézobia in these numerous families is not 
known in most cases. 
In regard to symbiosis of the Leguminosz in the same article 
Frank comes to the following conclusions: 
1. Atleast some of the Leguminosz live in symbiotic relations 
with a fungus with which the plant becomes infected as soon as 
it begins to develop in normal soil. 
2. This fungus has specific properties belonging to the 
Schizomycetes; it is the Rhizobium leguminosarum. 
3. The fungus probably develops and multiplies to some 
extent in the soil. 
4. The roots of the Leguminosz have the power of attracting 
the fungus. This is probably due to some peculiar secretion. 
5. The manner of infection is the same as described in 1890, 
6. The “Bakteroiden” of 1890 are now considered true fungi. 
They are, however, much modified through the assimilation of cell 
protoplasm. 
7. These modified fungi will not multiply outside of the 
vegetable cell, : 
8. A few normal fungi are always left over, which pass into 
the soil ready to infect other developing plants. 
9. There is only one species of Rhizobium. 
In comparing Frank’s résumé of 1890 with that of 1891 the 
following differences are noted: the Bakteroiden are not album- 
inous differentiations of the mycoplasm, but they are considered to 
be true, much-altered Rhizobia and these modified Riizobia can- 
not grow and multiply outside of the vegetable cell. He admits 
that in his former decision in favor of Bakteroiden he had been 
influenced by Brunchorst. Woronin in 1866 was the first who 
maintained that the Bakteroiden of Brunchorst were true bacteria. 
Indeed, Frank thought for a time that all the controversy about 
Bakteroiden being living organisms was due to Worontn. In the 
last year or two the strongest arguments are with Frank's latest 
