This procedure was developed in the Ethnobotanical Labora- 
tory of the Botanical Museum of Harvard University with the 
support and encouragement of Professor Richard Evans 
Schultes, Director of the Museum. I thank Professor Schultes 
and the Museum staff for their contribution to this project, and 
in particular, Professor Elso S. Barghoorn, Lillian Hanscom, 
Publications Secretary, and Wesley Wong, Librarian. 
SELECTED BIBLIOGRAPHY 
1. Dimbleby, G. W., Plants and Archaeology, Humanities Press, Inc., New 
York, 1967. 
2. Helbaek, H., ‘Palaeo-Ethnobotany’: in Science in Archaeology, (Eds. D. 
Brothwell and E. Higgs), Thames and Hudson, Bristol, 1963. 
3. Leo, R. F. and Barghoorn, E. S., “Silicification of Wood”, in Bot. Mus. 
Leafl., Harvard Univ., Vol. 25, #1, December 7, 1976. 
Pearsall, D.M., “Phytolith Analyses of Archaeological Soils; Evidence for 
Maize Cultivation in Formative Ecuador”: in Science, Vol. 199, January 
13, 1978. 
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