PLANT Cotors IN MaIzE Al 
Only nine F, sun red plants were tested by their F; behavior, and no 
later generations were grown. All the available data are given in table 
10 (page 128). Five F; plants, when self-pollinated (group 1 of the table), 
gave the expected three classes of progeny, sun red, dilute sun red, and 
green, with a distribution of the F; plants as given below, and in addition 
a single brown plant. To include this unexpected plant in the compari- 
son with the calculated distribution would give zero as the value of P, 
which is equivalent to saying that even in an infinite number of trials there 
is no chance of finding such a plant thru errors of random sampling. The 
single off-type plant is readily accounted for by supposing that a grain of 
foreign pollen was accidentally admitted in the pollination of the parent 
plant. Tho it is realized that, with such a convenient supposition always 
at hand, almost any result can be made to fit a theory, the reality of just 
such accidental pollinations will not be questioned by any one who has had 
experience in the technique of maize pollination. With the elimination 
of this one plant, the fit of observation to hypothesis is almost perfect. 
The comparison follows: 
Color types Sun red tule Green Total 
Ila IVa Via,‘e 
CIRGIRVEG! 6 & 2m ce ee eee ae 126 42 ae) 223 
‘CANICIUGRTE OL: = <2 1p Renee ae a ea 125 42 56 223 
Difierentce 12 See ane ae +1 | 0 —] 0) 
= 
Three F, sun red plants, including one of the five in the former test, 
were crossed back to green (group 1, table 10). The same three color 
types were observed as in the self-pollinated plants, with the addition 
again of a single off-type plant, this time a purple one. Even if this plant 
is left out of consideration as due to an accidental pollination, the fit of 
observed with calculated numbers is not very good. Such deviations 
from theoretical behavior are to be expected thru chance alone only once 
in eight trials, P equaling 0.12. The comparison follows: 
Dilute ‘ 
Color types Sun red eure Green Total 
Ila IVa Via, ¢ 
Wpserved) 2 25 8.502: ail be cee oath 14 18 50 82 
PACU ALCO sccm sc hccis iin BOS Ak aks 20.5 20.5 4] 82 
we LAY SINCE = gee 2 —6§6.5 —2.5 +9 0 
