31 
bility. The ‘O. dzennis"’ used by deVries in the experiments 
described in ‘“ Die pueunineiaat Ri to be a form with 
large flowers which appears to be native to the northern states, 
and which can hardly be nee arnt this name in its strictest 
nse. 
The search for mutants or seed-sports in other American 
species has met with gratifying success. One of the common 
evening-primroses is in a mutative stage, and one seed in about 
every three hundred gives rise to plantlets which differ markedly 
from the type. No description of this mutant can be given until 
a full cycle of development has been completed and the sseedling 
of the second generation are under observat 
Onagra cruciata has been found to consist of three elementary 
species which do not intergrade. One of these forms is also in a 
mutative condition and gives rise to the other two forms by 
seed-sports 
The hybrid O. Lamarckiana x O. cruciata consisted of a 
single type in the see acne in which the characters of the 
ollen-parent were largely dominant, although the anatomical 
limitations prevented their “ull normal expression. An interest- 
ing segregation of the unit characters involved in the arrange- 
ment for fertilization was offered by the fact that some of the 
flowers on a single plant were structurally suitable for self-polli- 
nation, while others were more favorable to cross-pollination. The 
second eobtan of oe appear to be identical with those 
of the first tae 
The h ao. Cael x O. htennis was of a pleiotypic 
Enotes ae. of four distinct types, without ee 
forms, in the first generation, which appear to breed t 
arkable predisposition, or weakness to the ere of a 
ate mere was exhibited by one of the types. The habit of 
inequality of growth of the leaves resul ee in crinkling, c 
acteristic of Lamarckiana, was transmitted t individu ae i 
the four types of the hybrid. The near a of the ter- 
minal rosettes of Lamarckiana was transmitted unchanged to two 
of the types. The capacity for self-fertilization was dominant in 
three of the types, but in the fourth a variability between cross- 
