18 MISSOURI BOTANICAL GARDEN BULLETIN 
for the forms which have been collected, the Garden her- 
barium being rich in such collections. 
Davis, A. R. (Ann. Mo. Bot. Gard. 3:407-412), has con- 
tributed a note of interest regarding chemical technique. In 
plant pathological and physiological work the nitrogen con- 
tent of very small organs or structures should frequently be 
known, and this paper is an indication of the adaptability 
of Folin’s “micro” method of nitrogen determination to the 
problems in these phases of botany. 
Duggar, B. M. (Ann. Mo. Bot. Gard. 3:1-10), in a pre- 
vious volume, discussed the economic importance and bio- 
logical life histories of the root-destroying fungi of the genus 
Rhizoctonia. In the present paper it is indicated that the 
common American species is the same fungus so widely dis- 
tributed in Europe under the name of “potting-bench 
fungus.” In Java and the East Indies the fungus, known 
as the “Mopopilz,” is of much economic significance in the 
destruction of seedlings of the Cinchona and of other plants. 
Duggar, B. M. (Ann. Mo. Bot. Gard. 3:11-24), has studied 
the Texas root rot fungus, which is one of the most disas- 
trous cotton diseases in Texas and the southwest. New ob- 
servations have been made upon the disease and upon its 
various host plants. In addition a conidial stage has been 
discovered and described, the significance of which, in the 
distribution of the disease, may be an important consid- 
eration. 
Duggar, B. M., and A. R. Davis (Ann. Mo. Bot. Gard. 
3:413-437) have drawn attention to the fact that all prob- 
lems relating to fixation of nitrogen in the soil by micro- 
organisms are of special agricultural interest as well as of 
fundamental importance. The results of this paper sug- 
gest that the representatives of the common moulds and 
other fungi are not important in the fixation of nitrogen, 
but a fungus parasitic upon the sugar beet, Phoma Betae, 
is found to have this capacity. The first fact controverts 
much European evidence and the last mentioned confirmed 
such previous studies. 
Emig, W. H. (Ann. Mo. Bot. Gard. 3:243-307), has con- 
tributed a study on the occurrence of wild yeasts and other 
related fungi, in which is brought together an account of 
all the fungi which have been described as pathogenic or 
probably pathogenic to man and the higher animals. The 
comprehensive summary made will also make an important 
point of departure for subsequent work. 
Gilman, J. C. (Ann. Mo. Bot. Gard. 3:25-84), has made 
an extensive study of the cabbage yellows, a disease which 
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