6 BULLETIN 754, U. S. DEPARTMENT OF AGRICULTURE. 
EXPLANATION OF TABLE I. 
In column 1 of Table I is found the pedigree number of the 
individual ears. When it so happened that two ears borne on the 
same plant were pollinated in such a way that they both appear in 
the same table, they are bracketed together, thus facilitating a com- 
parison of the behavior of two crosses having the same female 
parent and different male parents. 
Column 2 gives the pedigree number of the ear that resulted from 
self-pollinating the plant that served as the male parent of the ear 
in column 1. 
Thus, for example, the first two ears were borne on the same plant 
but were fertilized with pollen secured from different plants. The 
male parent of ear No. 1099 bore the self-pollinated ear No. 1106, 
while the male parent of ear No. 1100 bore the self-pollinated ear 
No. 1103. The seed classes of these self-pollinated ears can be found 
by referring to Nos. 1106 and 1103, where they occur in their numeri- 
cal places in column 1. 
In column 2 the word “ Self” indicates that the ear represented 
in column 1 is the result of self-pollination. 
As a further example, Nos. 1104 and 1105 may be taken. It is here 
possible to compare the result of crossing with a sister plant, the 
behavior of which, when self-pollinated, is shown under No. 1108, 
with the result of self-fertilizing the same plant. 
Columns 3, 4, and 5 are self-explanatory. Column 6 gives the 
deviation of the observed from the expected number of seeds, on the 
assumption that horny and waxy were approximating a 3 to 1 ratio. 
Column 7 (headed DE) gives the number of times the observed 
deviation (D) exceeds the probable error (E), and affords a basis for 
judging whether the difference between the observed and expected 
is a real or chance deviation. To facilitate the translating of D~E 
into probabilities, reference may be made to Table II, which shows 
the values copied without recalculation from Pearl and Miner (12). 
It was not thought necessary in Table I to include the probable 
errors, which were calculated by the formula 
0.6745./0.25 x 0.75 x ytotal seeds, 
since their only present use is in comparison with the deviations. 
The 96 ears shown in Table I were the results of self-pollinations, 
crosses between sister plants, or crosses between the two hybrids. In 
all cases the expected percentage of waxy seeds was 25. The progeny 
of the two hybrids have been examined and tabulated separately, but 
as no significant differences were found between them, it will save 
space to consider them as a single group. 
The 96 ears produced a total of 54,759 seeds, of which 23.9 per 
cent were waxy. This deviation of 1.1 per cent from the expected 
