MAIZE WITH SILKS MATURING BEFORE THE TASSELS. 



9 



tive frequency of the different degrees of proterogyny is shown 

 below : 



Number of days after the silks ap- 

 peared before pollen was shed — 2 —1 



Number of plants 1 9 



12 3 4 5 6 7 

 7 13 13 5 2 1 



Of the 29 plants grown from ear No. 1, the pericarps of 9 were 

 white, the remaining 20 being colored as in the parent ear. Of the 

 33 plants grown from ear No. 2, the pericarps of 11 were white, the 

 remaining 22 being a red of the same shade as the parent ear and 

 consistently lighter than the progeny of ear No. 1. 



The measurements shown in Table I are given with the idea of 

 providing data for determining the effects of acclimatization. The 

 size of a plant and of its various organs is so directly dependent on 

 the nature of the environment that measurements are of little value 

 for descriptive purposes except as they are made comparative by 

 including familiar varieties that may be used as a standard. If, 

 however, the expression of characters has been seriously disturbed 

 by the change of locality, the number of the different parts as well 

 as the actual dimensions may be expected to change in subsequent 

 generations, and the data here presented may serve as a rough indi- 

 cation of such comparative relations. Since in a number of char- 

 acters the differences appear to be significant and not the result of 

 chance variation, the average measurements of the plants grown 

 from each of the two ears as well as the combined averages are 

 recorded separately. 



Table I. — Measurements of plants grown, from, two ears of red pop com from Spain. 



Character. 



Height centimeters . 



Number of nodes above the ground 



Number of nodes alio ve the ear 



Numl >er of green leaves at silking 



Length of longest leaf centimeters. 



Width of longest leaf do. 



Number of nodes above longest leaf 



Distance from top of last leaf sheath to the lowest tassel 



branch centimel srs - . 



Distance from first to last tassel branch do. . . . 



Distance from last tassel I iranch to tip of tassel do 



Number of tassel branches 



Number of secondary 1 irancb.es in tassel 



Length of uppermost tassel branch centimeters. . 



Number of spikelets on uppermost tassel branch 



Length of staminate spikelets millimeters. . 



Number of ears per plant 



Number of rows in upper ear 



Number of rows in second ear 



Length of upper ear centimeters. . 



Number of suckers per plant 



Ear No. 1. 



249 ±3.55 



15.4 ± .12 

 4.93± .08 



14.5 ± .16 

 99.8 ±1.14 

 10.1 ± .13 

 10 ± .16 



3.55± .38 



13.8 ± .29 



29.9 ± .48 



21.6 ± .03 

 6 ± .39 



9. (if 



2.5 



18.3 



19.4 



19.3 



1.0 



.1(1 

 .08 

 .19 

 .42 

 .46 

 .19 



Ear No. 2. 



226.5 ±2.57 



14.3 ± 

 4.26± 



13.8 ± 



94.6 ± 



9.6 ± 



9.2 ± 



.12 



.1 



,09 



.88 

 09 

 13 



3.2 

 15 



27.9 

 26.6 

 • 7.4 

 18.2 

 82.8 



± 



± 

 ± 

 ± 

 ± 

 ± 

 ± 



9.78± .16 



2.8 ± .14 



15.8 ± 



17.3 ± 



18 ± 



2.1 ± 



.31 

 .31 

 . 30 

 .76 

 .48 

 .17 

 . 32 



.10 



.27 

 .37 

 .18 



Combined 



average. 



238.5 ±2.34 



14.8 



4.6 



14. 1 



97.4 



9.8 



9.6 



9. 73 ± 



2.7 ± 

 16.2 ± 

 18.8 ± 

 18. 6 ± 



1.8 ± 



.07 

 .07 

 .09 

 .75 



.07 

 .11 



3.4 ± .25 

 14.2 ± .22 

 29 ± .30 

 23.9 ± .59 



6.5 ± .30 



07 

 13 

 13 

 24 

 23 

 10 



[Cir. 107] 



