List of Contributors
*BURGES, A., Hartley Botanical Laboratories, University of Liverpool, England (pp. 1 and 479).
CLARK, F. E., U.S. Department of Agriculture, Fort Collins, Colorado, U.S.A.
(p. 15).
HALE, W. G., City of Liverpool College of Technology, Byron Street, Liverpool, England (p. 397).
HEAL, O. W., Natural Environment Research Council, The Nature Conservancy, Merlewood Research Station, Grange-over-Sands, Lancashire, England (p. 149).
KÜSTER, E., University College, Dublin, Ireland (p. 111).
LUND, J. W. G., Freshwater Biological Association, Ambleside, Westmorland, England (p. 129).
NEWELL, P. F., Westfield College, University of London, England {p. 413).
NIELSEN, C. OVERGAARD, Department of Zoology, Copenhagen University, Denmark (p. 197).
O'CONNOR, F. B., Department of Zoology, University College, London, England (p. 213).
PARK, D., Department of Botany, Queen's University, Belfast, Ireland {p. 435).
PARKINSON, D., Department of Biology, University of Waterloo, Waterloo, Ontario, Canada (p. 449).
RAW, F., Rothamsted Experimental Station, Harpenden, Hertfordshire, England (p. 323).
SATCHELL, J. E., Merlewood Research Station, Grange-over-Sands, Lancashire, England (p. 259).
STOUT, J. D., Soil Bureau, Department of Scientific and Industrial Research, Wellington, New Zealand (p. 149).
WALKER, N., Rothamsted Experimental Station, Harpenden, Hertfordshire, England (p. 493).
WALL WORK, J. A., Westfield College, University of London, England (p. 363).
WARCUP, J. H., Waite Agricultural Research Institute, Adelaide, South Australia (p. 51).
♦Present address : The New University of Ulster, Coleraine, Northern Ireland.
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