i 9 2o] COULTER— A LEU RONE COLOR 409 



ratio of 0:0.92:1 .08. The extreme ratios on individual ears were 

 0:0.81:1.19 and 0:1.03:0.97. Conclusion: slight but chronic 

 excess of colorless grains. 



II. — 0:9:7 predicted; from ppRrCc selfed. Five ears gave 

 0:418:320, or an average ratio of 0:9.06:6.94. Extreme ratios 

 on individual ears, 0:8.77:7.23 and 0:9.45:6.55. Conclusion: 

 predictions fulfilled. 



III. — 0:3:5 predicted; from ppRrCcXpprrCc. Three ears 

 gave 0:260:430, or an average ratio of 0:3.01:4.99. Extreme 

 ratios on individual ears, 0:3.19:4.81 and 0:2.94:5.06. Con- 

 clusion: predictions fulfilled. 



IV. — 1:1:2 predicted; from pprrCCxPpRrCc. Only one 

 ear with over 64 grains obtained. 



V. — 9:9:14 predicted; from ppRrCcXPpRrCc. Four ears 

 gave 229:242:262, or an average ratio of 10.11:10.35:11.54. 

 Extreme ratios on individual ears, 10.14:12.69:9.17 and 

 6.51:9.83:15.55. Conclusion: decided but not chronic excess 

 of colored grains. 



VI. — 3:3:10 predicted; from ppRrCcXPprrCc and pprrCcX 

 PpRrCc. Eight ears gave 252:235:765, or an average ratio of 

 3.22:3.00:9.78. Extreme ratios on individual ears, 3.60:2.07: 

 10.33 an d 4.42:3.58:8.00. Conclusions: predictions fairly well 

 fulfilled, considering smallness of population used. 



VII. — 9:3:20 predicted; from PprrCcX PpRrCc. Only one 

 ear obtained with over 64 grains. 



VIII. — 27:9:28 predicted; from PpRrCc selfed. Thirteen 

 ears gave 1534:464: 1560, or an average ratio of 27.59:8.35:28.07. 

 Extreme ratios from individual ears, 23.54:9.92:30.54 and 

 28 . 97 : 1 1 . 03 : 24 . 00. Conclusions : predictions well fulfilled ; slight 

 tendency toward excess of purple at expense of red (as was regu- 

 larly the case except, strangely enough, in the two individual ears 

 cited under extreme ratios) may well be accounted for by improper 

 classification, throwing a few deep red grains with the purple. 



From this preliminary experiment the general conclusion was 

 drawn that ratios produced by the interaction of these three 

 factors were sufficiently distinct to be readily recognized in the 

 vast majority of cases. This was confirmed by later experience, 



