MISSOURI BOTANICAL GARDEN BULLETIN 11 
of the attention of some members of the staff, and further 
interesting data have been secured bearing upon the nature 
of the infective agencies in this enormously destructive dis- 
ease. At the same time investigations have been instituted to 
determine the possibility of studying the life cycles of bacteria 
by means of ultra-filtration, thus applying some principles 
deduced in the case of the mosaic disease to a study of the 
life history of the bacteria in general. Finally, the pigmenta- 
tion of fruits, a study begun during the previous year, has 
been brought to conclusion. 
For the first semester of 1923-24 there have been offered 
the usual research courses, the seminar, and three lecture 
laboratory courses, somewhat more than the average num- 
ber, but during the second semester the number will be re- 
duced to not more than two. 
Published Articles and Notes—Since the previous report 
four numbers of the ANNALS have appeared, including No. 4 
of Volume IX, and Nos. 1, 2, and 3 of Volume X. The arti- 
eles appearing in these numbers in order of appearance are 
as follows: 
Rosen, H. R. ‘‘A. Bacterial Disease of Foxtail (Chaetochloa 
luteseens).’’ Col. LX, pp. 332-402. 
Young, H. ©. ‘‘The Toxic Property of Sulphur.’’ Vol. 
IX, pp. 403-435. 
Jennison, H. M. ‘‘Potato Blackleg, with Special Reference 
to the Etiological Agent.’’ Vol. X, pp. 1-72. 
Greenman, J. M. ‘‘Studies of South American Senecios.”’ 
pp. 73-110. 
Lehman, 8. G. ‘‘Pod and Stem Blight of Soybean.’’ 
pp. 111-178. 
Burt, E. A. ‘‘Higher Fungi of the Hawaiian Islands.’’ 
pp. 179-189. 
Duggar, B. M., and Joanne Karrer Armstrong. ‘“Indica- 
tions Respecting the Nature of the Infective Particles in the 
Mosaic Disease of Tobacco.’’ pp. 191-212. 
Camp, A. F. ‘‘Citric Acid as a Source of Carbon for 
Certain Citrus Fruit-Destroying Fungi.’’ pp. 213-298. 
Besides the articles listed above, attention should be drawn 
to the many shorter and popular articles in the BULLETIN, 
likewise to several articles appearing in garden craft and 
