110 
POSSIBILITIES OF CONTROL 
Though of a nature entirely different 
from boll-weevil injury, the club-leaf 
disorder may have a similarity in rela- 
tion to control measures, in that early 
setting of a crop may offer the best 
possibility of avoiding injury, supposing 
that insects are responsible for the 
transmission of the disorder. To be rid 
of insects in China may be as impos- 
sible as to exterminate the boll-weevil 
in the United States. Upland cotton 
The Journal of Heredity 
may have an advantage over the 
Chinese in the larger size of the bolls 
which may allow a larger crop to 
be set before the disease becomes in- 
jurious. Restricting the growth of the 
plants to insure early fruiting would 
be in order, but the usual Chinese meth- 
ods do not produce large plants. An 
advantage in early fruiting seemed to 
have been gained in the vicinity of 
Nanking by planting cotton on high 
beds, which is supposed to warm the 
ground earlier in the spring. 
Eugenics in Germany 
A prize of 1,000 marks is offered by 
the German Medical Society for Sexual 
Science and Eugenics to the writer of 
the best thesis on the question, “Has 
man two kinds of spermatozoa?” 
It is generally assumed by geneticists 
that the question is to be answered af- 
firmatively. This assumption is based 
on results of experimental breeding, 
which are most satisfactorily interpreted 
by such a hypothesis. Cytologists, how- 
ever, have not yet been able to offer 
satisfactory evidence from their micro- 
scopical studies to confirm the hypo- 
thesis. 
The German society, which is now in 
its eighth year, publishes the Archiv 
fiir Frauenkunde und Eugenetik, which 
is now in its fifth volume. 
At the meeting of January 16, 1920, 
Dr. Posner was elected president. The 
other officers chosen were: Dr. Franz, 
first vice-president; Dr. Iwan Bloch, 
second vice-president ; Dr. Max Hirsch. 
first secretary; Dr. S. Placzek, second 
secretary; Dr. Otto Adler, treasurer; 
Dr. Blaschko, Dr. Grotjahn, Dr. IH. 
Koerber and Dr. Stabel, directors. 
The headquarters of the society are 
in Berlin W. 30, Motzstrasse 34. 
Lock’s Last Work 
Recent Process IN THE STUDY OF 
VARIATION, HEREDITY, AND Evorwu- 
TION, by R. H. Lock, Sc. D. New 
(4th) ed., revised by L. Doncaster, 
Cen sk RES: Ps 2200, with 
glossary and illus. New Work: i. P: 
Dutton & Co., 1916. 
Dr. Lock published the first edition 
of his book in 1906. The second and 
third editions were his own revision ; 
the fourth shows only slight changes, 
which are due to Dr. Doncaster. A 
sketch of Dr. Lock’s life, by his wife, 
has been added to good advantage. The 
author gave up his life as a result of 
devotion to war service with the Board 
of Agriculture in England, in 1915, at 
the untimely age of 36. Most of his 
active years were spent at the Royal 
Botanic Gardens in Peradeniya, Ceylon, 
where he did useful work on rubber 
and rice particularly. The book is nec- 
essarily considerably out of date, yet it 
offers in many respects an excellent 
account for beginners in the study of 
organic evolution.—P. P. 
