118 S. IKENO : 



magenta contain l'2ß lungeutas and 30 leds, theoreticalh' 117±ö-4 and 

 39±5'4 respectively on 3:1 basis; fiu-tlier, we Lave seen that tlie F^ 

 generation ex red X oi'ange (or orange x red) (p. 101) as well as that ex 

 magenta x orange (p. 112) segregate each into 3 : 1 respectively-, i. e. 



1. CCRBhh X CCrrbb 



(red) X (orange) 



2. CCRBBB X CCBBbb 



(magenta) x (red) 



3. CCBBBB X CCrrbb ; 



(magenta) X (orange) 



cousequeutlj we should have in (3) the segi-egatiou 9 : 3 : 1 instead of 3 : 1, 

 •were it not for the complete linkage between B and B, as was stated before 

 (p. 114 S.) Onv present case is very similar to that of AquUegia leaves, green, 

 cldoriim and variegata, the well-known sa-called " Dreieck " of Baue' or to 

 that of the Rabbit, self-coloured, Himalayan and albino studied by PltsNETT.j 

 Thus, for instance, we have in Aqidlegia 



1. ftaBB X anbb 



(green) x (cJilorina) 



2. AAbb xaabb 



{variegata) x [chlorina) 



3. aaBB x AAbb 



(gi'cen) X (variegata) 



and in tlie Ilabbit 



1. cess X CCss 

 (self-coloured) x (Himalayan) 



2. CCss X cess 



(Himalayan) x (albino) 



3. CCSS X CCSS 

 (self-coloured) x (albino) 



1 Zeitsch. f. ml. Abstamm. «. Vererlwng.ilehre, Bd. fi, 1912, pp. 215-21fi. 



- Jotirn. of (JenHics, Vol. 2, 1912, pp. 230-237 ; nlso ibid., Vol. 5, 1915, pp. to -46, 



