106 



THE AMEBICAN NATURALIST [ Vol. LIIT 



ears produced as tlie result of the cross (Fi) and tlio 

 second j^eneration hybrid ears (l^..)^ tos:etlier for compari- 

 son (Figs. 1 and i'; ^IcCluer's Plates 1 and 2). Each of 

 these is a .loil M\(vl-.M,ni (to-s and the results, both of 

 Fi doniinaTicc and ()\' scmco'ation in the F^ ears, is very 

 l)lainly shown. In McCMuer's Plato 4 the results of 

 segreo-ation aic -liown, -o far as the rea])pearance of 

 parental types is concei-ned. Of course, in all these 

 crosses, it must l)e remend)ered that the ])arontal types 

 were not selfed strains, but were undoubtedly heterozy- 

 gous f()]' some of the factors under ol)servation. Thi^ i^ 

 shown in the wliite corn ear, coming out of a cross be- 

 tween Leaming (yellow dent) and Mannnoth Sweet. 



McCluer makes the i)enetratino- remark regarding the 

 production of V.> seeds that 



The ^olf-for(ili7<Ml ciii'^ tlu- -anic nioditicatiMn of korncl^ as 



those nnturallv fort ilizcl. provm- that nvh l-pvuel of the crossed corn. 



In tlio writ-T'^ npiiiimi. ////^ fhr mn^l >, uunlnhh 

 pres.siou upon thr jialnrc of },< t , > <r_,inn., . ,nn>h h, , 

 McndeVs time. 



The reai)pearance of i)areniMl Ix pc- i- rcfcncd t( 

 follows : 



A further indirect ('(.mnicnl on the snpci iorli \- in >ize 

 on the part of P", liybi id- i.- h'cii in MrCiuiT's -tntcment 

 that 



