e success or
failure of propagation technique. Doubtless both of these variables have
operated together in the propagation of existing varieties and, as would
be expected, the results have been unpredictable. It seems likely that
the grafting and budding of chestnut varieties should be worked out in
the future on the basis of using understocks derived from the seed of
special trees or clones found to be suitable sources by tests for
grafting performance.

It should be pointed out that the five trees used in this work
originated from two lots of seed imported from neighboring localities in
China and probably are closely related. The fact that significant
differences were obtained in this material furnishes basis for the
belief that great variability in the budding performance of the Chinese
chestnut is to be encountered in the many introductions that have been
made into this country.

Table I. Results of budding each of five Chinese chestnut clones on
its own seedlings and on the seedlings of four other clones. The
figure for each combination represents the number of buds that grew
out of 20 buds placed.

SCION

a b c d e Totals
S A 4 6 4 5 0 19
T B 3 2 8 4 0 17
O C 0 3 8 9 5 25
C D 1 2 3 1 1 8
K E 2 2 7 9 2 22
TOTALS 10 15 30 28 8 91

Discussion After Dr. McKay's Paper

Dr. MacDaniels: "A good scion on chestnut is one problem which we have
not solved."

Dr. Smith: "I find both Carr and Hobson difficult to graft and have
discontinued them."

Dr. Crane: "In California and Oregon they are having quite a lot of
difficulty with graft union failure with Persian walnuts. They have used
the Northern California black or Hinds walnut as root stocks. Now they
find that in some cases the union fails and results in what is known as
the black line disease. At the present time this trouble is the most
important cause of the loss of their trees."

Dr. Smith: "Zimmerman is a good bearing variety with a good nut. I find
that soil makes some difference with this variety."

Breeding Chestnut Trees: Report for 1946 and 1947

ARTHUR HARMOUNT GRAVES[5]

The chief aim of this breeding work is the development of a chestnut
tree of timber type to replace the now