Abstract
THE accompanying photograph shows the parents and F1 progeny of a cross between a normal bearded bread wheat (Triticum vulgare, Host, 2n = 42) and a branched or 'miracle' headed rivet wheat (T. turgidum, L., 2n = 28). A is a head from the pure line used as the female and B one from that used as the male, both from plants grown out of doors. Half the hybrid grains were started in Petri dishes on December 30, 1942, and the seedlings transferred about a week later to a greenhouse heated just sufficiently to keep out frosts. The remaining half was treated in the same way about the first week in the following February (the exact date is unfortunately lost).
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