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and Dr. Hermann Schlundt of the Department of Chemistry of the 

 University of Missouri has been repeatedly called upon for informa- 

 tion where the work in this bulletin required knowledge of physical 

 chemistry. Mr. A. J. Heinicke and other advanced students, who 

 have from time to time been connected with the Department, have 

 assisted in the laboratory in securing the data here published. All 

 chemical analyses have been made under the direction of Professor 

 P. F. Trowbridge of the Department of Agricultural Chemistry. 



Professor U. P. Hedrick of the Geneva, New York, Experiment 

 Station and Professor H. P. Stuckey of the Georgia Agricultural 

 Experiment Station, furnished twigs used in some of the freezings 

 reported in this bulletin. Professor Hedrick and also Professor 

 R. A. Emerson of Lincoln, Nebraska, were kind enough to furnish 

 publications that were not available here, as well as repeatedly to 

 give advice. 



Grateful acknowledgment is made to these men and to others 

 mentioned in this bulletin who have been kind enough to furnish in- 

 formation. 



