to the climatic conditions at the time of inoculation and later ; it 

 may be desirable to read the atmometers daily or even more fre- 

 quently, and to obtain thermograph tracings of the temperature 

 and special notes on the degree of cloudiness. The committee 

 will be glad to discuss forms of experiment in this field with any 

 cooperator who is interested. The details of such experiments 

 need to be worked out for each special case. 



CHEMICAL COMPOSITION OF THE PLANTS AS RELATED 



TO THE CHARACTERISTICS OF THE 



CULTURE MEDIUM. 



Besides the plant records mentioned in the preceding pages, 

 it is planned that the plants of selected cultures may be sub- 

 jected to chemical analysis, to determine the proportions of some 

 of their constituents, and that the results of these analyses may 

 be correlated with the characteristics of the media in which the 

 plants have been grown. Those who so desire may take part in 

 this aspect of the project by communicating with the com- 

 mittee, which will attempt to make arrangements by which one 

 cooperator may grow the plants while another performs the 

 analyses. These analyses are planned to deal with both mineral 

 and organic constituents of the plants. 



^ 



54 



