WILLIAM

U-BERT HOBBS

University

DEPENT OF AGRICULTURE,

Ann Arbor. UREAU OF SOILS-BULLETIN NO. 58.

MILTON WHITNEY, Chief.

Issued May 10, 1910.

BUREAU OF SOILS.

MILTON WHITNEY, Chief of Bureau.
ALBERT G. RICE, Chief Clerk.

SCIENTIFIC STAFF.

FRANK K. CAMERON, in charge of Chemical and Physical Laboratories.

C. W. DORSEY, in charge of Soil Survey, Western Division.

JAY A. BONSTEEL, in charge of Soil Survey, Eastern Division.
OSWALD SCHREINER, in charge of Fertility Investigations.
W J MCGEE, in charge of Soil Erosion Investigations.