1889. | NEW YORK ACADEMY OF SCIENCES, 151 
country; and yet I think it a matter of doubt whether the rock 
can be worked with profit. The mass before us is an unusually 
rich specimen of ore, and there is tin enough in it to pay for 
crushing and washing; but a great deal of that sort of work is 
often done by nature; almost all gold-mining depends for its 
success upon decomposition of the rock. The gold-bearing rock 
has been made ready for the hand of the washer by natural pro- 
cesses, otherwise it would not pay to work; and the same is 
generally true of tin. 
THE PRESIDENT called upon Mr. Witttam E. Dopas, ex- 
pressing his pleasure at that gentleman’s presence, and desiring 
him to make further remarks upon the subject, as one with 
which he was familiar from extended experience in the commer- 
cial value and production of metals. 
Mr. Dope@s, in reply, expressed great interest in the facts 
as presented by Mr. FurMAN, but stated that he did not feel suf- 
ficient familiarity with the local conditions to add anything to 
the discussion at present. 
March 25, 1889. 
STATED MEETING. 
The President, Dr. NEWBERRY, in the chair. 
Sixty-five persons present. 
The fourth Public Lecture of the season’s course was deliv- 
ered by the Rev. EK. C. Boxes, of New York, upon 
THE LITTLE BUILDERS OF THE EARTH, 
and was largely illustrated with lantern views. 
