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, S. Dak.; J. C. Thysell, Dickinson, N. Dak.; M. Piaender, Mandan, N. Dak.; 
pons We “Osborn, Lawton, Okla.; Ww. D. Griggs, Dalhart, Tex.; J. E. Mundell, Big Spring, Tex.; F. L. 
_ Kelso, Ardmore, S. Dak.; W. ie Peterson, Mandan, N. Dak.; J. T. Sarvis, Mandan, N. Dak.; G. W. 
Mercan 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. = Ruzicka, Williston, N. Dak.; A. W. Schulz, Mandan, N Dak: R. W. Wilson, Mandan, 
N. or - . E. Lyness, Archer, Wyo.; F. A. Wagner, Big Spring, Tex.: H. J. Clemmer, Woodward, | 
Okla.; F. = 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. Weisz 
Burr, and J. H. Jacobson. ey. 
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 oper ated by the United cee 
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 na * 
cooperated in obtaining the meteorological data reported. 
