11 
[Annual Meeting. 
warded two of our boxes, one shipped early in the season and 
the other at one of the last ports visited, and these arrived here 
without accident. 
Mr. Crosby spent the month of September in the Black Hills of 
Dakota, and in the adjacent Bad Lands of the White River region. 
He made an interesting collection of the Archaean and Paleo- 
zoic rocks. His investigations, a paper on which was read before 
the Society at the meeting held March 7, treated principally of 
the nature and relations of the Archaean strata of the Black Hills. 
He also gave an account of the origin of the coarse, tin-bearing 
granites ; the cause of the conformable contact between the Pots- 
dam and Carboniferous throughout the western country ; the date 
and history of the Black Hills uplift ; the nature of the volcanic 
masses, which are stated to be chiefly intrusive sheets and lacco- 
lites. The absence of true glacial phenomena was also noted, the 
coarse gravel and erratic boulders covering the surrounding plains 
being in his opinion residual deposits of Tertiary age. 
Report on the Secretary’s Department and the Library, by 
Edward Burgess, Secretary. 
During the past year no important event has occurred in the Sec- 
retary’s department. The usual data in regard to meetings, mem- 
bership, library and publications, will be found below. 
Membership. 
The membership of the Society remains exactly the same as last 
year. Eighteen Associate Members have been elected, but no Cor- 
porate, Corresponding or Honorary Members. 
During the past year we have lost three Associate Members by 
death, four by resignation and two whose names have been dropped 
for non-payment of dues. Three Corporate Members have died. 
Dr. Clias. E. Ware and Mr. Wm. Perkins, patrons of the Soci- 
ety, Mr. Nathaniel Cummings, Mr. Wm. E. Baker and Mr. Avery 
Plummer, Life Members, have died during the year. 
The Society has lost by death Mr. R. C. Greenleaf, a patron and 
Ex-Vice President of the Society. 
