. nigra_ before the bagging occurred, since only _J. nigra_
characteristics have shown up in the seedling. In 1950, one bud of the
_nigra_ seedling 40.70-P1 has almost completely regenerated the top of
the tree and no symptom of the disease is evident. By contrast in 1944,
almost all of the top of the tree was occupied by diseased limbs, five
in number, of the O'Conner seedling.

_Tree Number 854._ This tree has shown behavior almost identical with
that of Number 838, but three seedlings were topworked instead of one.
All three originated from the Coye hybrid and all were budded on July
27, 1944. Less than one month later all buds had produced a foot or more
of growth, and one to two scions of each seedling reached sufficient
size and vigor to survive the following winter without damage. None of
the scions branched in 1944, and all failed to show symptoms of the
disease. Early in 1945 profuse branching occurred on the one surviving
scion of seedling number 39.03-P2, and by midsummer excessive
proliferation of the buds of primary shoots had resulted in the
formation of a mistletoe-like growth characteristic of the disease.
Scions of the two other seedlings, 39.03-P8 and 39.03-P11, were lost
by wind damage in midsummer, but at the time they showed no signs of the
disease. Most of the shoots of 39.03-P2 were killed during the
following winter, and in April, 1946, the remaining live portions were
removed by the Division of Forest Pathology for use in transmission
studies.

On August 18, 1944, four patch buds of the O'Conner natural hybrid were
placed on one of the main limbs of this tree. One of these buds grew,
and in 1950 has come to occupy more than half the top of the tree. The
remainder of the top is made up of the original stock tree. There is no
evidence of bunching in the tree at present.

_Tree Number 411._ This tree was budded to six seedlings of the Fox
natural hybrid on April 28, 1943. Only one of these lived, 40.45-P4,
and one scion of this seedling in 1950 comprises the entire crown. No
symptom of the disease has appeared in this scion, and the tree is
healthy at present.

On April 8, 1944, small lateral limbs of the tree were splice-grafted to
two Coye seedlings, 39.03-P8 and 41.26-P10. One scions of each grew
vigorously during the summer, and 41.26-P10 first became chlorotic,
then diseased. Seedling 39.03-P8 became chlorotic but at the end of the
season had not shown symptoms of the disease. Both were re