MISSOURI BOTANICAL GARDEN BULLETIN 37 
_The role of soil conditions in determining the suscepti- 
bility of certain plants to some important fungus diseases. 
The effect of smoke upon various forms of vegetation, with 
special reference to the determination of the comparative 
injury to different plants, and the use of certain easily-in- 
jured plants as indicators in determining areas affected. 
A continuation of some studies upon the effect of certain 
gases on fruits and vegetables; an endeavor to determine the 
value of ventilation in the shipment and storage of fruits and 
storage products; the effect of the wrappers on transported 
fruits. 
The relation between certain alge found commonly in 
the soil and the fixation of free nitrogen ; an attempt to throw 
further light on the relation of alge to certain phases of the 
soil fertility problem. tae 
_ A monographic study of the native polypores of Missouri. 
The polypores are corky fungi, including many of the more 
important organisms causing forest tree diseases and timber 
decays. 
A study of the physiology of the common damping-off 
fungus of greenhouse cultures and seed beds, with special 
reference to the conditions influencing the activity of the 
parasite. 
The pathological importance of wild species of yeasts. A 
considerable number of yeast species have been obtained from 
various sources and an endeavor will be made to determine 
the possible relation of those to certain abnormal animal 
growths. 
A study of the life history and physiology of Chlamydo-. 
monas, one of the most primitive organisms of the vegetable’ 
kingdom. 
The toxicity of aluminum compounds towards plants. 
The effects of conditions on the development of pigments 
in plants, with reference also to the factors causing the in- 
— tensification of coloration in certain structures. 
The effects of certain fungicides and spray mixtures on 
the physiological activities of leaves. 
A new method for the bacteriological ans of air. In 
the application of this study it is intended to determine 
