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TRANSCRIBER NOTES:

    Words in italics are indicated with an underscore (_) at the begining
    and end. Words in bold are indicated with an equal sign (=) at the
    begining and end. Subscripts contained in chemical notations are
    indicated as _{ }.

    The table on page 32 has been modified to fit by the use of
    keys to replace some of the information.




  U. S. DEPARTMENT OF AGRICULTURE.

  BUREAU OF PLANT INDUSTRY--BULLETIN NO. 129.

  B. T. GALLOWAY, _Chief of Bureau_.


  BARIUM, A CAUSE OF THE
  LOCO-WEED DISEASE.


  BY

  ALBERT C. CRAWFORD,

  PHARMACOLOGIST, POISONOUS-PLANT INVESTIGATIONS.


  ISSUED AUGUST 22, 1908.

  [Illustration]


  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_.




LETTER OF TRANSMITTAL.


  U. S.