All of the members of the scientific staff of the Office of Dry-Land Agriculture have contributed more 
or less to this bulletin by having charge of field investigations and by assisting in the preparation of data 
for records or for publication. The scientific staff as at present constituted consists of the following members 
named in the order of length of service: E. F. Chilcott, Woodward, Okla.; O. J. Grace, Akron, Colo.; 
J. S. Cole, Washington, D. C.; J. M. Stephens, Moccasin, Mont.; A. L. Hallsted, Hays, Kans.; O. R. 
Mathews, Belle Fourche, 8. Dak.; J. C. Thysell, Dickinson, N. Dak.; M. Pfaender, Mandan, N. Dak.; 
W. M. Osborn, Lawton, Okla.; W. D. Griggs, Dalhart, Tex.; J. E. Mundell, Big Spring, Tex.; F. L. 
Kelso, Ardmore, 8. Dak.; W. A. Peterson, Mandan, N. Dak.; J. T. Sarvis, Mandan, N. Dak.; G. W. 
Morgan, Havre, Mont.; H. G. Smith, Tucumcari, N. Mex.; L. N. Jensen, Amarillo, Tex.; R. S. Towle, 
Edgeley, N. Dak.; A. J. Ogaard, Hettinger, N. Dak.; C. B. Brown, Garden City, Kans.; L. D. Willey, 
Sheridan, Wyo.; J. B. Kuska, Colby, Kans.; A. E. Seamans, Huntley, Mont.; L. L. Zook, North Platte, 
Nebr.; C. H. Ruzicka, Williston, N. Dak.; A. W. Schulz, Mandan, N. Dak.; R. W. Wilson, Mandan, 
N. Dak.; W. E. Lyness, Archer, Wyo.; F. A. Wagner, Big Spring, Tex.; H. J. Clemmer, Woodward, 
Okla.; F. E. Cobb, Mandan, N. Dak.; A. Osenbrug, Scottsbluff, Nebr.; J. F. Brandon, Akron, Colo.; 
and T. P. Baird, Moccasin, Mont. 
The following-named men have held positions on the scientific staff of the Office of Dry-Land Agriculture 
during the past nine years, but have resigned or have been transferred to other offices of the Department 
of Agriculture: Sylvester Balz, F. L. Kennard, J. E. Payne, L. E. Hazen, C. A. Jensen, H. R. Reed, W. O. 
Whitcomb, C. H. Plath, F. Knorr, R. W. Edwards, H. C. McKinstry, C. A. Burmeister, J. G. Lill, W. W. 
Burr, and J. H. Jacobson. 
The data here reported from the stations in Kansas, Nebraska, North Dakota, and Montana have been 
obtained in cooperation with the agricultural experiment stations of the respective States. In South 
Dakota, Colorado, Texas, Oklahoma, and New Mexico the stations are operated by the United States 
Department of Agriculture. ° 
Field, office, and laboratory facilities, teams, and implements have been provided by the Office of West- 
ern Irrigation Agriculture at Huntley, Mont., Belle Fourche, S. Dak., and Mitchell, Nebr., and by the 
Office of Cereal Investigations at Amarillo, Tex., and Archer, Wyo. The Biophysical Laboratory has 
cooperated in obtaining the meteorological data reported. z 
