\\>l. XXI. November, iyn. Xo. 6 



mOLOGICAL BULLETIN 



THE PERSONAL EQUATION" IX BREEDING EXPERI- 

 MENTS INVOLVING CERTAIN CHARACTERS OF 



MAIZE. 1 



RAYMOND PKARL. 



Iii the summer of 1908 some experiment-, in the i TO-- -breeding 

 iin types of maize were begun 1>\ the \\ riter .UK I hi- former 

 colleague, I )r. Erank M. Surface. Tin- pve-ent paper ha- tn do 

 \\ith a part of the results obtained by crossing a \\hitr -\\eet 

 \atieiy (c? parent) with a yellow dent \arirtv (9 parent'. 

 Hoth \anVties used were "pure," in tin- -en-e that each bred 

 true to the general type to which it belonged. The hi-tor\ of the 

 sweet variety used has been detailed in another place' and in . d 

 not be repeated here. The important tiling tn In- iMinl at thi- 

 time is that in its whole historv thi- -ui.-t ((.in n-<d in tin- 

 cross breeding experiments had never been known t<> prudinr 

 anv but su'eet (sugary) kernels of an exceptional de^n-e o| 

 whiteness* 



The dent corn used in the experiment^ ua- al~o of knoun 

 lii-toi'\ . A discussion of its hi.-t'>r\. and of the characteristics 

 of the corn has been given elsewhere. 4 The essential point tobe 

 noted here is that during a long period d years ii ha- ne\ er 

 ced anything except starchy kernel- ot a d(i p 

 when ri|)C. 

 I'.ipi-rs from the Biological Laboi. nluir.il l-;\|i.-iinnm 



St.lt I. ill. \. i. 2Q. 



I ''iil. R.. and Surface, F. M., "I Corn." Me. 



it. Stat. Ann. Report fur tgio, ; 



A pure chalky white or. put in tin- mlit-i uay. tli.- (.ntiro .ili-ciici- \ yellow 

 color, i- .in absolute essential of a lii.yh Ki.nii- . .1" mm fnun tin- P.I. k. r'~ -tamlpnint. 

 Ilu irn here under discussion is regarded by expert ;inn- 



ally tiii<- >tiair, for their purpose. 



1 iv.ul. K.. "The Mendelian Inhcritan. c !' Ortain Invi-ilil.- ("ln-n. 

 chr. f. Ahst.- u. \'crcrb.-'.< I'. \ 1 ;ii. 



