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To explain chiasmata, there have been two hypotheses advanced, namely the alternate opening out hypothesis ('classical theory', ' McClung's theory') and the (partial) chiasmatype hypothesis. Sax, K. (1930, 1932) advocated the former combined with the inclusive theory of subsequent breakage at the cross of the chiasma, while Belling (1931, 1933) and Darlington (1930, 1932) independently put forward the latter hypothesis. The present paper reports in part the results obtained from observations made during this series at chiasma studies in plants.

CHIASMA STUDIES IN PLANTS, I. CHROMOSOME PAIRING AND CHIASMA BEHAVIOUR IN <i>ALLIUM MOLY</i>