Received for publication 29 June 1987. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.
Assistant Professor. Present address: Suburban Experiment Station, Univ. of Massachusetts, 240 Beaver St., Waltham, MA 02154.
Former undergraduate student who conducted this experiment as a minor problem.
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