ray-curves

Updated: July 1, 2026

Now the secondary summits of the ray-curves of the composites are seen to agree, as a rule, with these figures. Other instances could readily be given. Our second heading includes those cases which exhibit two summits of equal or nearly equal height. Such cases occur when different races are mixed, each retaining its own average and its own curve-summit.

Hugo de Vries - Species and Varieties, Their Origin by Mutation