48 
(1) Most of these are results of a cross with our splendid 
Japanese-American (H 86-31), which now at the age of six years 
is 19 feet high. Inoculation tests show that this is rather 
susceptible to the blight. These crosses, therefore, represent an 
effort to combine some of the practically immune Chinese 
chestnut stock with this hybrid stock. I believe that they are the 
most important crosses we made this year. 
(2) These crosses were made merely because various pollens 
arrived at Hamden so late that there was nothing but the 
’ Seguinit to put them on. It would, however, 
4a ’ 
everblooming 
be convenient to have some everblooming hybrids from this 
Chinese chinquapin for use in further breeding work. 
(3) These represent back crosses of good Japanese-American 
hybrids with disease-resistant Japanese stock. 
(4) These are all intercrosses of good Japanese-American 
hybrids. 
(5) These trees, hybrids of the Chugurt nuts (received by Dr. 
Reed of this Garden in 1931 from Japan; see notes 11 and 12, 
p. 68 of Brooklyn Botanic Garden Record, Vol. 25, 1936) and of 
58, bloomed this year in their second year. We crossed them with 
each other, and as a result got two fine nuts, these representing, 
therefore, a third generation. The original Japanese parent is 
vigorous and healthy—not tall (7$ feet high this year—6 yrs. 
old)—with two green labels as the result of inoculation tests to 
date (see p. 50). It is promising stock for chestnut orchardists. 
(6) The last four crosses were made on a hybrid of Hairy 
Chinese with Chinese chinquapin (C. Seguinii) froma nut borne in 
1934. This hybrid bloomed well for the first time, in this its third 
year of growth, was prolific like its chinquapin parent, and, more- 
over, continued blooming well into July, thus also showing 
Chinese chinquapin characters (Fig. 4). 
Summary of New Hvbrids.—Thirty-two hybrids new to science 
have resulted from our crosses to date. With three exceptions, 
all these new hybrids are represented by living trees. Of course, 
none of the new hybrids of 1937, although the nuts were planted 
last fall, are as yet set out on the plantations. Three hybrids 
(C. mollissima * C. dentata, 1934; C. mollissima * C. Seguinii, 
1934; and C. crenata X C. Seguinii, 1935) published as new in 
previous reports, are published in the U.S. D. A. Yearbook for 
