67 
Sciences, and the Herbarium of the New York State Museum at 
Albany, I have also been identifying Brazilian Cyperaceae for the 
University of California at Berkeley. There has been the usual 
routine identification of specimens collected for the herbarium 
and for exchange with other institutions. 
Forest PATHOLOGY 
By ArtHur HarMouNnT GRAVES 
Chesinut Breeding Work in 1933 
The object of this work, which has already been set forth fully 
in reports of previous years (BrookLyN Bor. GArb. ReEcorp 19: 
62-67, 1930; 20: 83-87, 1931; and 21: 46-53, 1932) is, briefly, 
to obtain if possible a chestnut tree to replace the now nearly 
extinct native chestnut which has been killed off by the blight. 
Such a new stock should be both blight-resistant and of timber 
For 
— 
quality, 7.ec. capable of attaining considerable height growth. 
the present, our method is to cross-pollinate the blight-resistant 
Japanese chestnut, a low-growing, orchard type of tree, with the 
susceptible American timber tree, in the hope of getting, among 
the offspring of these two parents, the desired combination, that 
is, a blight-resistant tree of the tall timber type. 
During the past year the work has proceeded principally along 
red young trees and 
jan 
three lines: 1. The culture of some four hunc 
seedlings of various chestnut species and hybrids, including the 
collection of extensive data on growth rates and habit tendencies ; 
2. The production of new hybrid nuts of Japanese and American 
parentage; and 3. The addition of several lots of seeds and seed- 
ings of native American chestnut to our collections, forming the 
nucleus of a group from which desirable strains may be selected 
— 
for future work. 
1. Culture of Chestnut Seedlings 
pt 
Hybrids of 1932.*—Of the 189 hybrid nuts produced by the 
crossing of Japanese and American chestnuts in the summer of 
1932, only 65 (34.3 per cent.) geminated. The reasons for this 
* We have adopted the plan of naming and dating our hybrids according 
to the year in which the cross-pollination was effected, although, of course, 
the nuts do not germinate until the following season. 
