Published in Proceedings of the National Academy of Sciences 38(8), pp. 662–666, August 1952. The communicated date, 7 June 1952, is a manuscript date.[ref]
Cited passages: pp. 662–663: wet blotters, covered dishes, darkness, 20 °C and a two-prism glass spectrograph; p. 664: seven lots of 200 seeds, 16-hour dark imbibition, one-minute red and four-minute far-red exposures, and a two-day endpoint; p. 665, Table 1: qualitative red/far-red reversal and incomplete suppression; p. 663: pigment identification explicitly deferred.

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