HUMIC ACID INVESTIGATIONS

University College of North Wales1 Received for publication January 20, 1959 1 Department of Agricultural Chemistry, U.C.N.W., Bangor, Caernarvonshire, Great Britain. Present address of Khan: Chemistry Division, Department of Agriculture, Georgetown, British Guiana, South America. The authors are grateful to Charles Evans and other members of the staff for their discussions of the work. C. B. Coulson is indebted to the Agricultural Research Council of Great Britain for support of the work and to the University of Wales for the tenure of an I.C.I. Research Fellowship. At time of writing, the report of Part II was submitted for publication in J. Soil Sci.