108 R. A. EMERSON 
reds had colorless pericarp, and greens had in part brownish and in part ) 
colorless pericarp. The deviations from the expected 27:9:18:20 relation | 
of these four color classes were such as might occur thru errors of random 
sampling in more than seven out of any ten such trials, P equaling 0.72. 
The comparisons follow: 
Dilute Dilute 
Plant color Green Green Total 
purple — sun red 
Pericarp color Cherry Colorless Brownish Colorless 
Illa IVa Vib_—_—siII lg, IVg, Vic r 
Colored aleurone: : 
Observed... . 43 10 0 39 88 | 
Calculated. . . 44 15 0 297 88 |, 
Difference. . . il ==) 0 +6 0 | 
Colorless aleurone: . 
Observed.... 38 11 32 28 109 | 
Calculated... 40 els 27 29 109 
Difference. . . =h yy, +5 ==. 0 
Further tests of the factorial composition, with respect to Pl, of some 
F, green plants of this cross are afforded by crosses between them and sun 
red and dilute sun red plants. One F2 green crossed with sun red gave 
27 purple plants (table 49, group 2). Since the green parent plant came 
from a colored seed, it is assumed to have been Pl Pl R?’ R?’ plus A A or 
Aa. Two other greens crossed with dilute sun red gave 39 dilute purple 
plants, and were therefore Pl Pl (group 2, table 49). Since one of these 
green plants had brownish and the other had colorless pericarp, they are 
assumed to have been also 7 and R! R’, respectively. A fourth Fs 
green crossed with sun red gave purple and sun red plants, and a fifth 
green crossed with dilute sun red gave dilute purple and dilute sun red 
plants, indicating Pl pl (group 3, table 49). The first of these two had 
brownish and the second had colorless pericarp. They must therefore 
have been r™ and R? R’, respectively. A sixth F, green crossed with 
dilute sun red gave only dilute sun red plants, and so must have been 
pl pl (group 4). 
