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LETTER OF TRANSMITTAL. 
U.S. DEPARTMENT OF AGRICULTURE, 
BurEAvU OF PLANT INDUSTRY, 
OFFICE OF THE CHIEF, 
Washington, D. C., July 2, 1910. 
Srr: [have the honor to transmit and to recommend for publication 
the accompanying manuscript, entitled ‘‘ Orchard Green-Manure Crops 
in California,’ by Mr. Roland McKee, Scientific Assistant in the 
Office of Forage-Crop Investigations, and recommend its publication 
as Bulletin No. 190 of the Bureau series. 
Leguminous cover crops are now extensively used in California 
citrus orchards, but only to a slight extent in deciduous orchards. 
Owing to peculiar conditions certain legumes are especially adapted 
for use in that State, while their usefulness elsewhere is limited. 
The results presented in this bulletin are based on the investiga- 
tions that have been conducted at Chico, Cal., and in cooperation 
with many orchardists for the past five years. 
Respectfully, 
G. H. PowE tt, 
Acting Chief of Bureau. 
Hon. JAMES WILSON, 
Secretary of Agriculture. 
190 3 
