Year When | 
Nut Was | Name Number Height in 1936 
Produced 
1931 Hammond—crenata & dentata| H86-31 14 feet 103 in. 
vi 7 7 H94--31 9 feet 6 in 
i Winthrop ae ‘ | W40-31 9 feet 
: Sn m1 th 7 7 S170C-31 10 feet 6 in. 
7 - my S200 B’-31 10 fee 
: ‘ $238-31 10 feet 7 in 
es ‘ ~ $ 239-31 10 feet 9 in 
1932 pb 7 7 110-32 9 feet 10) in 
1933 | * Minturn ‘ e M19’-33 6 feet 8 in. 
“ Hammond, - HitsA’—33 6 feet 1 in. 
1934 /S8 X crenata | on 3 feet 5 in. 
| mollissima as Seguin | 2 3 4 in 
1935 /dentata * S nt roo 35 | 2 feet 4 in 
S8 & dent: — | | foot 9 in 
The vearly records of these trees are interesting as showing the 
rapid rate at which they push upward. Take, for instance, the 
starred individual in the table. “Phe height growths are as follows: 
nd of 1934, after one year’s growth, 1 foot 10 in, 
End of 1935, after two years’ growth, 4 feet 3 in. 
end of 1936, after three vears’ growth, 6 feet 8 in. 
It is evident that all these remarkable growth rates are the ex- 
pression of hybrid vigor. The growth of the native chestnut 
(C. dentata) is about one foot per vear. 
Disease Resistance of the Chinese Chestnut—bLast year we re- 
ported the presence of the blight at the base of 5 of our choicest 
Chinese chestnuts, then 9 years old. This vear we take pleasure 
in reporting the entire healing of every one of the lesions caused 
by the blight on these trees. We had suspected for several years 
that the physical expression of resistance in the chestnut was 
accomplished by the formation by the tree of a cork layer imme- 
diately adjacent to the discased tissue, effectively preventing 
further advances of the fungus. The appearance of a paper by 
Mr. W. C. Bramble * in February, 1936, deseribing and figuring 
such cork formation im lesions caused by the fungus on the 
American chestnut is evidence of the correctness of this view. 
* Bramble, W.C. Reaction of chestnut bark to invasion by /ndothia para- 
sitica. Amer. Jour. Bot. 23: 89-94, 1930, 
