46 PHILOSOPHICAL SOCIETY OF WASHINGTON. 
Mr. Tuomas Russevu presented a communication on 
NORMAL BAROMETERS, 
which was discussed by Messrs. Brturncs and HARKNEss. 
Mr. N. H. Darron read a paper 
ON THE OCCURRENCE OF COPPER ORE IN THE TRIAS OF THE 
EASTERN UNITED STATES, 
and Mr. J. S. DitueEr followed with a communication on 
THE LATEST VOLCANIC ERUPTION IN NORTHERN CALIFORNIA AND 
ITS PECULIAR LAVA. 
[Published in Am. Jour. Sci., 3d series, vol. xxxiii.] 
Remarks on the last paper were made by Mr. Ipp1nes. 
2938p MEETING. DrcEeMBER 4, 1886. 
By courtesy of the trustees of the Columbian University the meet- 
ing was held in the law lecture-room of the University building. 
Invitation to attend the meeting was extended to the members of 
the Anthropological, Biological, and Chemical societies and of the 
Cusmos Club. ‘Two hundred and two persons were present. 
Vice-President MALLERY presided. 
The Chair read a letter from the secretary of the Chemical Society 
inviting the members of the Philosophical Society to listen, on the 
evening of Dec. 9, to an address by Prof. H. W. WILEY, retiring 
president of the Chemical Society, on “ Our Sugar Supply.” 
President Brituines then presented his annual address, the sub- 
ject being 
SCIENTIFIC MEN AND THEIR DUTIES. 
[Printed in full on pp. Xxxv-Lvi of this volume.] , 
A vote of thanks for the address was passed by the audience. 
