636 
of that journal after the death of his brother in 
1887, until last year. In the editorship of the 
Monthly and in many other directions Dr. You- 
mans did much for the diffusion and advance- 
ment of science in America. 
WE also regret to record the death of Pro- 
fessor John Thomas Duffield, for more than 
forty years professor of mathematics in Prince- 
ton University. He was born in Pennsyl- 
vania in 1823, and graduated from Princeton 
College in 1841, where he was first appointed 
tutor. in Greek and in 1847 adjunct professor of 
mathematics. Dr. Duffield was the author of 
various publications on religious and mathe- 
matical subjects. 
Mr. ARTHUR COPPEN JONES died, at Davos, on 
March 8th, at the age of thirty-five years. Mr. 
Jones studied under Huxley at the Royal 
School of Mines, but was compelled to go to 
the Engadine when only 20 years old, owing 
-to an attack of tuberculosis. When his health 
improyed, he studied bacteriology and was the 
author of a paper advocating the view that the 
tubercle bacillus is a fungus. He translated 
Fischer’s ‘ Structure and Function of Bacteria,’ 
recently issued from the Clarendon Press. 
Dr, FRANZ MELDE, professor of physics in 
the University at Marburg, died on March 16th 
at the age of sixty-eight years. 
Mrs. EMMA FLOWER TAYLOR, daughter of 
the late Roswell P. Flower, has given $60,000 
to Watertown, N. Y., for a public library in 
memory of her father. 
THE committee, appointed by the Interna- 
tional Congress of Geologists on the 25th, of 
August last, has announced as the subject pro- 
posed for the Spendiaroff prize for 1903 ‘A 
Critical Review of the Methods of Classification 
of Rocks’ (Revue critique des méthodes de 
classification des roches). The value of the 
prize is 456 roubles or about $240. Manuscripts 
should be addressed to M. Charles Barrois, 
secrétaire général du Congrés Géologique In- 
ternational, 62, boulevard Saint Michel, Paris. 
At least two copies of papers submitted in com- 
petition are required, and they should be sent, 
at the latest, a year before the next session of 
the Congress in 1903, 
PrRorressor Topp writes from Port Said on 
SCIENCE. 
[N. S. Vou. XIII. No. 329. 
March 25th, stating that the expedition sent 
from Amberst College under his direction to 
observe the eclipse of the sun in the Dutch 
East Indies, has reached that point two days 
ahead of his ephemeris and should be in Singa- 
pore on or before April 15th. .The station for 
this observation of the eclipse is likely to be 
the little island of Sinkop, one of the lesser 
dependencies of the Sultan of Rhiow, about a 
day’s journey southeast of Singapore. In ad- 
dition to Professor Todd’s apparatus for pho- 
tographing the corona, which is partly auto- 
matic, Dr. Wright, of Yale, has provided an 
equipment of apparatus for determining the 
photographic polarization of the corona. ; 
AN expedition to Samoa and the Pacific 
Islands for the study of mosquitoes in relation 
to the diseases which they bear has been 
planned at the instance of Dr. Patrick Manson. 
The sum of $5,000 has been subscribed anony- 
mously and it is hoped that the British Govern- 
ment will assist. The Lancet states that here 
the investigators would set themselves to study 
the local mosquito, and, having obtained full 
knowledge of its habits, they would proceed to 
investigate the mosquitoes of an island in which 
malaria is endemic. They are then to convey 
the anopheles from the malarial to the non- 
malarial island and to endeavor there to breed 
the anopheles under laboratory conditions. In 
the aquarium thus formed there would be in- 
troduced certain plants and animals which are 
apparently peculiar to Samoa with the view to 
discover, in one or another of these, something 
antagonistic to the anopheles. The experiment 
would then be repeated under conditions as 
nearly natural as might be possible. Dr. Man- 
son hopes that by this means there may be dis- 
covered a something which is hostile to the 
anopheles, and which may be subsequently 
turned to good account by being introduced 
into islands and localities where malaria is 
epidemic. The Pacific islands are suggested 
by Dr. Manson from the fact that they also 
afford unique opportunities for the study of. 
filariasis and elephantiasis. In many of the 
islands this latter disease attacks from 20 to 50 
per cent. of the population, and in others 
filariasis attacks from 30 to 60 per cent. But 
there are also small islands with populations of 
