106 
The Journal 
A DURANGO COTTON PLANT 
This plant was in a somewhat protected 
situation at Nanchang, China, but shows 
the effect of the club-leaf disorder, in a rather 
mild form, in its restricted growth, distorted 
and discolored leaves, and the fruit aborted. 
There is however little reduction in size of 
leaves or shortening of petioles. (21761.) 
(Fig. 5.) 
through the seed, as may be inferred 
from the normal growth and fruiting of 
the plants early in the season, but if the 
disorder is caused by insects which live 
also on other plants, as seems not im- 
probable, there would be danger of im- 
of Heredity 
portation with 
stock or bulbs. 
ornamentals, nursery 
GENERAL CONTRAST BETWEEN CHINESE 
AND UPLAND VARIETIES 
Experiments with American varieties 
are being made in many places in China, 
in the hope that larger crops and better 
quality of fiber can be secured than 
from the native stock. The rapidly ex- 
panding textile industry of China needs 
more cotton, and efforts are now being 
made to increase production as rapidly 
as possible. The existence of such 
plantings made it possible in the season 
of 1919 to compare not only the normal 
behavior of the Chinese cotton and 
American varieties, but to observe the 
effects of the club-leaf disorder upon 
several kinds of cotton growing under 
a wide range of climatic and cultural 
conditions, as already noted. 
The results of the comparison may be 
summarized by saying that the mor- 
phological reactions of the club-leaf 
disorder are most pronounced in the 
Chinese cotton, while in the American 
Upland varieties the physiological re- 
actions are more striking. The Chinese 
cotton shows more pronounced changes 
in its habits of growth, while the U: 
land cotton shows more discoloraion. 
Fruiting is suspended in both types 
when the club-leaf disorder is severe, 
though it was noted at Wuchang that 
the Trice cotton continued to produce 
bolls on the club-leaf growth, which 
in the neighboring Chinese cotton was 
entirely barren. ‘Trice had a general 
advantage on account of earliness, 
though Lone Star and Acala appeared 
promising in some of the drier dis- 
tricts, and especially at Peking. 
REACTIONS OF EGYPTIAN AND SEA 
ISLAND COTTONS 
Several of the plantings included 
Egyptian and Sea Island cotton so that 
the club-leaf reactions could be com- 
pared. In general these types agree 
with the Chinese and contrast with the 
Upland in failing to develop a red dis- 
* coloration of the leaves, but the rela- 
