BARIUM, A CAUSE OF THE LOCO-WEED DISEASE. BY ALBERT C. CRAWFORD,

Pharmacologist, Poisonous-Plant Investigations. Issued August 22, 1908.

WASHINGTON: GOVERNMENT PRINTING OFFICE. 1908.

BUREAU OF PLANT INDUSTRY.

Physiologist and Pathologist, and Chief of Bureau, Beverly T. Galloway.

Physiologist and Pathologist, and Assistant Chief of Bureau, Albert F. Woods.

Laboratory of Plant Pathology, Erwin F. Smith, Pathologist in Charge.

Investigations of Diseases of Fruits, Merton B. Waite, Pathologist in Charge.

Laboratory of Forest Pathology, Haven Metcalf, Pathologist in Charge.

Cotton and Truck Diseases and Plant Disease Survey, William A. Orton, Pathologist in Charge.

Plant Life History Investigations, Walter T. Swingle, Physiologist in Charge.

Cotton Breeding Investigations, Archibald D. Shamel and Daniel N. Shoemaker, Physiologists in Charge.

Tobacco Investigations, Archibald D. Shamel, Wightman W. Garner, and Ernest H. Mathewson, in Charge.

Corn Investigations, Charles P. Hartley, Physiologist in Charge.

Alkali and Drought Resistant Plant Breeding Investigations, Thomas H. Kearney, Physiologist in Charge.

Soil Bacteriology and Water Purification Investigations, Karl F. Kellerman, Physiologist in Charge.

Bionomic Investigations of Tropical and Subtropical Plants, Orator F. Cook, Bionomist in Charge.

Drug and Poisonous Plant Investigations and Tea Culture Investigations, Rodney H. True, Physiologist in Charge.

Physical Laboratory, Lyman J. Briggs, Physicist in Charge.

Crop Technology and Fiber Plant Investigations, Nathan A. Cobb, Crop Technologist in Charge.

Taxonomic and Range Investigations, Frederick V. Coville, Botanist in Charge.

Farm Management Investigations, William J. Spillman, Agriculturist in Charge.

Grain Investigations, Mark Alfred Carleton, Cerealist in Charge.

Arlington Experimental Farm, Lee C. Corbett, Horticulturist in Charge.

Vegetable Testing Gardens, William W. Tracy, sr., Superintendent.

Sugar-Beet Investigations, Charles O. Townsend, Pathologist in Charge.

Western Agricultural Extension Investigations, Carl S. Scofield, Agriculturist in Charge.

Dry-Land Agriculture Investigations, E. Channing Chilcott, Agriculturist in Charge.

Pomological Collections, Gustavus B. Brackett, Pomologist in Charge.

Field Investigations in Pomology, William A. Taylor and G. Harold Powell, Pomologists in Charge.

Experimental Gardens and Grounds, Edward N. Byrnes, Superintendent.

Foreign Seed and Plant Introduction, David Fairchild, Agricultural Explorer in Charge.

Forage Crop Investigations, Charles V. Piper, Agrostologist in Charge.

Seed Laboratory, Edgar Brown, Botanist in Charge.

Grain Standardization, John D. Shanahan, Crop Technologist in Charge.

Subtropical Laboratory and Garden, Miami, Fla., Ernst A. Bessey, Pathologist in Charge.

Plant Introduction Garden, Chico, Cal., W. W. Tracy, jr., Assistant Botanist in Charge.

South Texas Garden, Brownsville, Tex., Edward C. Green, Pomologist in Charge.

Farmers’ Cooperative Demonstration Work, Seaman A. Knapp, Special Agent in Charge.

Seed Distribution (Directed by Chief of Bureau), Lisle Morrison, Assistant in General Charge.

Editor, J. E. Rockwell. Chief Clerk, James E. Jones.

POISONOUS-PLANT INVESTIGATIONS. SCIENTIFIC STAFF.

Rodney H. True, Physiologist in Charge.

C. Dwight Marsh, Expert in Charge of Field Investigations.

Albert C. Crawford, Pharmacologist.

Arthur B. Clawson, Expert in Field Investigations.

Ivar Tidestrom, Assistant Botanist, in Cooperation with Forest Service.