52 R. A. EMERSON 
(group 2, table 21) with the crosses of sun red and green. While certain - 
of the individual progenies, due perhaps to the small numbers concerned, 
deviate considerably from the expected results, the twenty-one progenies 
(groups 1 and 2, table 21) taken together approach so closely to expectation 
that there is more than one chance in four that the observed deviations 
may be due to errors of random sampling, P equaling 0.28. The com- 
parison of observed with expected numbers follows: 
Dilute 
Color types Sun Ted ee Green Total 
Ila IVa Vila, ¢ 
Observed: 
Tle exe VIC ese eee eee 827 268 383 1,478 
Vine SOV ila ia eee reese a ae 343 120 179 642 
otal sac hier ee are sete 1,170 388 562 220) 
Calculated! = sec (on ees eee 1,193 398 530 U4 OA | 
Dilerencesya- wen Se ee eee —23 —10 +32 —] 
F, sun red plants, A a B b pl pl, were also backcrossed with green plants 
of type VIc, ab pl. Fifteen progenies of these backcrosses are listed in 
table 21, the progenies from the cross Ila x VIc in group 3 and those from 
the cross IVa x Via in group 4. The expected relation of 1:1:2 was 
realized fairly well in the results, the odds against the observed devia- 
tions’ being due to chance being about three to two, P equaling 0.39. 
The observed and expected results are compared as follows: 
Color types Sun red ae Green Total 
Ila IVa Vila; ¢ 
Observed: 
(illasxRVElc) exe VEG hen sn tre pert tcp 134 123 267 524 
(TIGA SE AVA EN) SEN latin tierce SEN 442 A465 962 1 ,869 
Ovale eee he ees ee 576 588. 14229 2 393 
Calculatedhiavees eee. es 598 598 1,196 2 ,392 
Difterence cre echt ee wc eee —22 —10 +33 +1 
