\ 



LETTER OF TRANSMITTAL 



U. S. Department of Agriculture, 



Bureau of Plant Industry, 



Office of the Chief, 

 Washington, D. C, August 11, 1911. 

 Sir: I have the honor to transmit herewith a paper entitled "The 

 Wilting Coefficient for Different Plants and Its Indirect Determina- 

 tion," by Dr. L. J. Briggs, Physicist in Charge of Physical Investiga- 

 tions, and Dr. H. L. Shantz, Plant Physiologist, of this Bureau, and 

 recommend its publication as Bulletin No. 230 of the Bureau series. 

 Respectfully, 



B. T. Galloway, 



Chief of Bureau. 

 Hon. James Wilson, 



Secretary of Agriculture. 



