122 Shull. 



Nicotiana Tabacum (tobacco) 1 ): 



Number of leaves ^ (Hayes 1912, Hayes, East and 

 Height of stem j Be in hart 1913) 



Length of leaf i 



Breadth of leaf (Hayes, East and Beinhart 1913) 

 Area of leaf 



Oenothera (Evening primrose): 



Red veins of leaves (Heribert-Nilsson 1913) 2 ) 

 Phaseolus vulgaris (bean): 



Length of seeds , 



^.v:, , i (Emerson 1910, Johannsen 1913) 



Width of seeds J 



Thickness of seeds ^ 



^ . , , , \ (Emerson 1910) 



Weight of seeds / 



Pisum sativum (pea): 



Time of flowering 3 ) (von Tschermak 1911, 1912) 

 Stizolobium (Lyon beans, velvet beans): 



Size of pods j 



Size of seeds I (data of Belling) (Emerson and East 1913) 



Time of flowering | 

 Triticum vulgare (wheat) : 



Red grain-color 



Length of internodes, (Nilsson-Ehle 1908, 1909, 1911 a) 



i.e., density of heads | 

 Beardlessness (Nilsson-Ehle 1908) 



Glume-color ^ 



(Nilsson-Ehle 1909) 

 Height of stem J 



Resistance to yellow rust 



(Puctini'a glumarum (Nilsson-Ehle 1908, 1911a) 



1 ) GOODSPEED (1912, 1913) has demonstrated a notable increase in variability 

 of flower-size in the F 2 of certain tobacco-hybrids, but refuses to ascribe this greater 

 variability to Mendelian segregation. 



2 ) HERIBERT-NILSSON assumes that practically all the genetic phenomena of Oeno- 

 thera may be explained on the basis of plural Mendelian determiners, but gives no 

 relevant data except for the red nerves of one of his mutant forms. To one who is 

 familiar with the genetic phenomena in Oenothera his conclusions in this regard must 

 appear premature. 



8 ) KEEBLE and PELLEW (1910) have also interpreted the inheritance of time of 

 flowering as well as height of plants of Pisum on the basis of several Mendelian deter- 

 miners affected by partial coupling, but assign definitely diverse functions to these 

 several determiners. 



