1Received for publication April 29, 1974.
2Department of Horticultural Science, University of Guelph, Ontario, Canada.
3Present address, Ontario Ministry of Agriculture and Food, Clarksburg, Ontario, Canada.
4Model 5806 by Nuclear-Chicago.
5Model Speedomax W, by Leeds & Northrup, Ltd., England.
6Model K140, by Kaye Instruments Inc., Cambridge, Mass.
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