No. 560] SHORTER ARTICLES AND DISCUSSION 511 



, o.!>:n. 



In this case the whites appear in excess of the ] 

 reds = 2,163 

 whites 2,322 " 

 Dividing the sum of all the reds bred by the stun of all the whites 

 bred we get an excess of reds— 6,670 : 5,957 = 1.12. 



These counts ;uld nothing new to the theory of association, but 

 are in agreement with Morgan's ratios. 



P. W. Whiting 



A DISCUSSION OF THE RESULTS OBTAINED BY 

 CROSSING ZEA MAIS L. (MAIS DJAGOENG) 

 ( — RE ANA LUXURIANS DUR. — TEOSINTE) 

 AND EUCHL.ENA MEXICANA SCHRAD 1 



Tjie author prefaces his discussion of the hybrids of maize and 

 teosinte with a minute study of the male and female spikelets of 

 both plants, showing the similarity between them. 



After reviewing the work of Harshberger with the cross maize 

 c? X teosinte $, he takes up the result of his own reciprocal cross, 

 maize ? X teosinte He shows that the first generation hy- 

 brids by the latter cross were uniform and agree closely with 

 those from the reciprocal cross made by Harshberger. 



The plants of the second hybrid generation of the cross, maize 

 2 X teosinte J form a diverse series, of which the different indi- 

 vidnals differ widely in stooling and branching ability, as well as 

 in the structure of the ear. A complete reversion, however, to 

 either one of the parent types never occurs. The series tends 

 more towards the maize than the teosinte type, and it is shown 

 that associated with the stronger development of the maize type, 

 is a reduction in the number of branches, a reduction in the 

 number of ears per plant, a less horny texture of the axis and of 

 the calyx-glumes, and a reduction in the depth of the pits of the 



