THE AMEBIC AN NATURALIST [Vol. XLIX 



Unpigmented seed-c 



This confirms the results from the early sowing. 



Pigmentation of Seed-coat and Semi-sterility 

 The coupling between K and P is given from the following : 

 Second Generation of Florida by Yokohama 



The excess of pigmented semi-sterile and of unpigmented fer- 

 tile testifies to a slight coupling, and calculation shows that there 

 is probably about 35 per cent, of crossing-over. 



According to the hypothesis (1), fertile second-generation 

 plants should be mainly homozygous for H (or h) and P (or p) ; 

 while semi-sterile plants should be mainly heterozygous for these 

 factors. This is being further tested. 



John Belling 



Florida Agricultural Experiment Station 



1. Belling, J. 



1914. The mode of inheritance of semi-sterility in certain hybrid 



plants. Zeitsdir. f. hid. Abst.- u. Verebungslehre 12: 303- 

 342. 



1915. Inheritance of partial sterility. Eeport of Fla. Agr. Exp. Sta. 



for 1914. Pp. 96-105. 

 3. Sturtevant, A. H. 



1915. The Behavior of the Chromosomes as Studied through Linkage. 

 Zeitschr. f. ind. Abst.- u. Vererbungslehre 13: 234-287. 



