10 MISSOURI BOTANICAL GARDEN BULLETIN 
Zeller, S. M. [Three abstracts of physiological articles in] 
Bot. Abstr., 1918. 
Zeller, S. M., and Dodge, C. W. “Gautieria in North 
America.” Ann. Mo. Bot. Gard., 1918. 
Zeller, S. M., and Dodge, C. W. “Rhizopogon in North 
America.” Ann. Mo. Bot. Gard., 1918. 
The two following papers were presented during convoca- 
tion week of the American Association for the Advancement 
of Science before the Botanical Society of America and Sec- 
tion G of the Association, at Baltimore, December 26 and 27: 
Duggar, B. M. “Some Factors in Plant Physiological Re- 
search.” 
Moore, George T. “Botanical Participation in War Work.” 
In the paragraphs below are given brief indications re- 
specting the nature and significance of the investigations 
completed and published during the year: 
Bonns, W. W. (Ann. Mo. Bot. Gard. 5 : 225-299), as a 
result of a study extending over two years, has made a full 
survey of the literature relating to the etherization of plants 
and its effect on enzyme activity. At the same time he has 
conducted extensive experiments on the effect of etherization 
on metabolism as expressed by the action upon the activity 
of diastatic, ees and catalase-like enzymes extracted 
from the bulbs of Gladiolus and from the germinating seed 
of barley. The results indicate no constant stimulation of 
enzyme action as a result of etherization and a definite in- 
hibition of catalase activity. 
Burt, E. A. (Ann. Mo. Bot. Gard. 5 : 119-182) discusses 
the species of Corticium “ey distributed in subtropical and 
tropical regions, causing the Pellicularia disease of the coffee 
plant; that causing the Hypochnose of pomaceous fruits in 
the United States; and ths form so widely distributed 
throughout the world, causing the various types of the so- 
called Rhizoctonia disease. 
Burt, E. A, (Ann. Mo. Bot. Gard. 5 : 177-203) presents 
a monographic account of the genus Aleurodiscus, resupi- 
nate form of Thelephoraceae. This is in fact a genus made 
up of species related to Corticium and Stereum, but 
ing spores of large size and a fructification often much in- 
crusted with granular matter. Fourteen of the twenty-five 
known species occur in North America. Seven new species 
are described, and four new combinations given. 
Burt, E. A. (Ann. Mo. Bot. Gard. 5 : 301-372). In the 
tenth contribution of his monograph on the Thelephoraceae 
of North America the author i the very important 
genus Hymenochaete. He brings to light some important 
