PLANT Coors IN MaIzE 33 
for both B and PI. This expectation was fully realized. In group 1 of 
table 4 are recorded the progenies of nine crosses with a total of 263 indi- 
viduals. All but one plant of the lot were purple. The one dilute sun 
red plant was presumably due to accidental pollination of the dilute 
sun red mother plant. Since the dilute sun red parents of all these crosses 
were A A bb pl pl, the brown parents of the crosses listed in group 1 must 
presumably have been aa BB PI Pl. Similarly, the seven crosses listed 
in group 2 gave purple and sun red plants only, 143 of the former and 147 
of the latter. Evidently the brown parents of these crosses were aa BB 
Pipl. Again, the six crosses shown in group 3 gave 105 purple, 123 
dilute purple, and no other plants. The brown parents of the crosses 
were therefore, presumably, aa Bb PI Pl. Finally, the four crosses listed 
in group 4 gave 9 purple, 11 sun red, 19 dilute purple, and 17 dilute sun 
red. The brown parents of these four crosses are assumed, consequently, 
to have been aa B b Pl pl. hd 
The F, results from the purple F; plants of these crosses of dilute sun 
red with brown are recorded in table 5.~ Fourteen progenies of the F; 
plants listed in table 4 are shown in group 1 of table 5, and five progenies 
from similar F; plants not listed in table 4 are entered in group 2. Here, 
just as with the results of the cross of purple with green (table 2), fairly 
marked discrepancies between theory and observation appear when the 
several progenies are taken separately. When, however, the nineteen 
progenies are considered together, very close agreement is found between 
observation and expectation, as is shown by the comparison below. The 
probability that such deviations as are observed may be due to chance is 
approximately 0.88, which means that only about once in eight trials 
would as good a fit be expected. The comparison follows: 
E Sun Dilute Dilute 
Color types. Purple red purple sun red 
Ta Ila Illa IVa V Via; b;.¢ 
Brown Green Total 
Observed..... 847 282 281 94 267 233 2 004. 
Caleculated.... 845 282 282 04. 282 219 2 004 
Difference... . +2 0 -—1 0 —15 +14 0 
Backcrosses with green VIc.— In addition to the F»2 results noted above 
as derived from self-pollinated F, purple plants, a few F, purples were bac 
