98 



S. IKENO ; 



Crossing Experiments. 



Oi'OaS I. WIdte-I -K orange .aud vice versa. (PI II, fig. 8 and 3). 

 ccrrbh x CCi'rbh F^ — Ccrrbb 



The wliite vaiiety designated liere by the name loUte-I has greenish 

 stems and leaves, white petals, filaments, stigmas, aud hghtly greenish styles ; 

 ■uhile the orange variety has reddish stems and leaves, orange petals, red 

 filaments, stigmas, and styles. The following crosses were made: orange x 

 white-I in 1915, wliite-I x orange in 1916 and 1917. The J^-plants have 

 paler orange flowers than in the orange pai-ent (s. the Table of Colours, p. 96). 

 The offepring in i^-and i^-generation are indicated in the Table I ; it may 

 here be remarked that the diiference of homo-and heterozygous orange plants 

 in these generations is so slight in respect to their colom that we could 



Table I. 



F, -generation (1916, 1917, 1918).' 



Fj-generation (1917, 1918). 



' The results of F.,-, Fj-gcneralions, etc. in all my crosses were recorded in my field-book 

 separately for each flower, but in the jiresent jiaper the offspring derived from one cross are 

 collected together for brevity's sake, except in some si^eciol cases. 



+ The figures affixed to the expected numbers denote always their respective stamlard errors 

 calculated by the wcll-knjwn formula ir = ^npq. 



