Vernalization and Photoperiodism — 82 — A Symposium 



ing; 14 short periods induce premature flowering, but prevent the reversal, 

 the plants die; in the latter variety 7 short days have no influence, but 14 

 determine the onset of flowering, reversal and second reproductive stage. 



For particulars about the treated species and for the discussion of lit- 

 erature I must refer to my former papers. 



References: 



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 Kon. Acad. Wet, Amsterdam 44: 989, 1941. — 9. Funke, G. L., De Natuur 62; 48, 1942. — 10. 

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 1939. — 19. Rasumov, V. I., Bull. Appl. Bot. Ill, 3: 217, 1933. — 20. Roodenburg, J. W. M., 

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