ON CROSSES WITH DISSIMILAR HEREDITY. 255 
It would take too long to treat here of the relations between crossings 
of equal and unequal heritage. I would, however, remark that both pro- 
cesses may take place simultaneously. In one and the same crossing 
one pair of characters may be equally transmitted and the other un- 
equally. An example of this I have previously described under the name 
of CEnotJiera Pohliana* This is the cross progeny of (Enothera lata, 
which, as above mentioned, yields false crosses, and of (E. brevistylis, 
which yields true ones. The first generation consists therefore in part 
(mostly 15 to 20 per cent.) of lata plants, in part of Lamarchiana indi- 
viduals ; both types, however, as regards the hrevistylic character, are 
tnie crosses. In the second generation the length of the style varies, 
there appear partly true brevistylis plants and partly plants which at 
one and the same time are lata and brevistylis, and these occur 
together in proportions which agree with Mendel's law. 
* Botanisclt Jaarhoek Dodomea, Gent, 1897, pp. 74 and 90. 
Fig. 123. — Odontoglossum ceispum nobiliuk. {Journal of Horticulture.) 
