280 PLANT HYBRIDIZATION BEFORE MENDEL 



ter) ; as to pubescent and glabrous chaff, beardless and bearded heads, 

 brown and light-colored glumes. The varieties used in the crosses are 

 as follows ; 



Compactum-vulgare Crosses Table 



Little club {compactum) $ X Emporium {vulgare) $ I 



Little club {compactum) 9 X Jones' Winter Fife {vulgare) i II 



White Track {vulgare) 9 X Little Club {compactum) 6 III 



Little Club {compactum) 9 X Valley {vulgare) $ IV 



Emporium {vulgare) 9 X Little Club {compactum) $ IX 



Little club {compactum) 9 X Farquhar {vulgare) ^ XI 



Farquhar {vulgare) 9 X Little Club {compactum) $, XII 



Valley {vulgare) 9 X Little Club {compactum) ^ XIII 



Little club {compactum) 9 X Turkey {vulgare) ^ XIV 



V 



VI 

 VII 

 VIII 

 Red Chaff 9 X Lehigh ^ X 



Summarizing the results in the tables for Spillman's fourteen crosses, 

 the data of F^ inheritance for the characters investigated are as follows : 



Compactum-vulgare Crosses Table 



Long 2546.1 



Semi-long 37544 



Short 1967.1 



A ratio of 1 : f 1.4I : 1, or approximately 1 : 2 : 1. 



Awns 



Heads awnless 4770-3 



Heads awned 880.8 



A ratio of 5.4 : l, instead of the expected one of 3 : 1. However, if 

 individual tables are taken (omitting Table XII) normal ratios exist. 



Pubescence of Glumes 



Glumes pubescent 4224.7 



Glumes glabrous 137 ••8 



A ratio of 3.1 : 1 



Color of Glu7nes 



Glumes brown in color 3143.7 

 Glumes light 1061.8 



A ratio of 2.9 : 1 

 Referring to the results from individual tables, the following may be 

 cited in illustration, from the compactum-vulgare crosses: 



