icant but the difference between varieties is highly significant.

Table II. Scores from five samples of black walnuts each cracked by six
operators according to scoring schedule II.

Operators
----------------------------------
Variety Location Year 1 2 3 4 5 6 Average

Snyder Ithaca, N. Y. '46 89.2 87.3 78.9 94.4 87.5 91.5 86.5
Thomas Ithaca, N. Y. (A) '46 83.5 79.2 83.1 78.0 84.2 83.8 83.6
Thomas Ithaca, N. Y. (B) '46 73.1 67.4 73.4 74.1 69.6 83.8 73.6
Cresco Ithaca, N. Y. '46 66.0 69.2 63.1 67.2 68.5 60.2 65.7
Brown Ohio '45 62.5 51.0 65.4 60.4 48.1 64.8 58.7
-------------------------------------------------------------------------
Average 74.9 70.8 72.8 72.8 71.6 78.8 73.6
Least significant difference (5%) for variety averages 6.2

A third scoring system, involving 1) weight of kernels in grams for the
first crack, plus 2) total weight of kernels, 3) all divided by the
number of marketable pieces (as counted following sifting on a 1/4"
round hole screen) was tried, and the resulting ranking of the varieties
was very similar to that obtained with systems I and II. The results
from this system appeared to be the most precise, but it was not
considered as generally acceptable as system II, since the latter would
be easier to record and calculate.

It is the opinion of the authors that Schedule II gives a score that
estimates very well the relative merit of the samples tested as to
crackability, yield and marketability. It is simple to use and the only
equipment required is a scale accurate to 1/10 gram. Calculations are
reduced to a minimum and the characters used are not dependent on
judgment of the individual making the test. It should be pointed out,
however, that differences in score of less than six points are not
significant on the basis of testing done to date. As more tests are made
this value may be reduced. The schedule should serve as a measure to
establish differences between varieties, particularly when a
considerable number of tests are made. It can also be relied upon to
measure differences due to the location of trees of the same variety,
variation of the same variety from year to year in the same and in
different locations and differences of a similar nature. In