PcrsoDdl n)id Sciciitijic Nezvs. 135 
months in Paris, engaged in investigating the petrology of 
the crystalHne rocks of northeastern Minnesota. The results 
of his work are to be published in one of the reports of the 
Geological and Natural History Survey of Minnesota. 
The Geological Society of Washington at its meeting 
of December 22rd, elected the following officers for the 
ensuing year: President,, Arnold Hague; vice-presidents, J. 
S. Diller and Whitman Cross; treasurer, M. R. Campbell; 
secretaries, C. Willard Hayes and T. W. Stanton; members- 
at-large of council, S. F. Emmons, G. P. Merrill, W. H. 
Weed, David White and Bailey Willis. 
The Geological Society of America at its meeting held 
in Montreal the last week in December, elected the following 
officers: President, J. J. Stevenson; first vice-president, B. K. 
Emerson; second vice-president, G. M. Dawson; secretary, 
H. L. Fairchild; treasurer, I. C. Wliite; editor J. Stanlev- 
Brown; librarian, H. P. Cushing; councillors, W. M. Davis, 
Robert Bell and M. E. Wadsworth. The membership roll of 
the Society, including four fellows elected at this meeting, 
-contains 246 names. The treasurer's report shows that the 
vSociety's financial condition is prosperous, thus making it 
possible to illustrate more fully future publications. 
New York Academy of Sciences, Section of Geology, Dec. 
20th, 1897. — The first paper of the evening was by Mr. Arthur 
Hollick, entitled "Recent Explorations for Prehistoric Im- 
])lements in the Trenton Gravels, Trenton, N. J." Dr. Hol- 
lick gave in his paper a summar\- of the present understand- 
ing of the artefacts found in the Trenton gravels, a more com- 
plete statement of which has already been published in 
Science for November 5, 1897. ' '""^ second paper of the 
evening was by Prof. J. V . Kemp, entitled "Some Eruptive 
Rocks from the Black Hills." Prof. Kemp summarized the 
geological features and history of the Black hills, and gave 
a bibliography of the works concerning these de])osits. He 
then mentioned the occurrence of some leucite bearing rocks, 
in the northern part of the hills, similar in character to those 
which occur in but few other places in this country, as in 
Wyoming, Montana, Lower California, and New Jersey, near 
the Franklin furnace. Richard E. Dodge Sccrctiiry. 
The Minnesota Academy of Natural Scie.^ces at its 
last regular meeting (Jan. 5) elected the following officers for 
the year 1898: Prof.'N. H. Winchell, ])resident; Prof. D. T. 
MacDougal, vice-president; Mr. .\. D. Roe, recording secre- 
tary; Dr. C. P. Berkey, corresponding secretary; Mr. E. C. 
(rale, treasurer. At this meeting steps were taken looking to- 
ward an at least temporary change from the former monthly 
meeting to more important meetings to be held less frequently. 
