70 BOTANICAL GAZETTE (JULY 
parents to be heterozygous, and it puts no strain on the “errors of random 
wired to account Aust the Sopnusauecd three as a purely chance result. Re- 
s bet O. Lamarckiana seem to have resulted 
in each case in a progeny of iabeccabes and Lamarckiana, though the deter- 
minations were defective. The appearance of these two types in the first 
in the F, and breed true in later generations. This new use of the expression 
will result in confusion if it is adopted by others, 
ince all Mendelian inheritance is “alternative,” as the expression is now 
ists. 
GATES is of the opinion that O. rubricalyx represents a progressive muta- 
tion from O. sedanlaet and that it is not to be explained on the basis of the 
presence and abse ypothesis. For the a le and direct, though some- 
what formal and — terminology generally used in describing Mendelian 
behavior, GATES would substitute “ a quantitative readjustment of the rela- 
tion between the substances which by their chemical interactions produce 
anthocyan, and those which decompose : as soon as formed, or which, by their 
presence, divert the metabolic processes and bring about chemical reactions 
of a different sort.” 
ile the extent of the anthocyan in O. rubricalyx proved to be strictly 
uu 
r 
riES® has continued his studies on hybridization in the oenotheras, 
and announces results of unusual theoretical interest, which together with the 
discovery of “twin hybrids,” earlier reported? by the same author, the reviewer 
8 DeVries, H., Ueber doppeltreziproke Bastarde von Oenothera biennis L. und 
O. muricata L. Biol. Centralbl. 31:97-104. 1911 
, On twin hybrids. Bot, GazETTE 44:401-407. 1907. 
