MARCH, 1882. No. 6. 
PRICE OF THE TRANSACTIONS. 
« 
To residents of the City of New York, not members of the Academy, $5.00 
per annum. To non-residents, $3.00 per annum, 4o cents per number. To resi- 
dent and honorary members, they are free; extra copies, 30 cents per number. 
TRANSACTIONS 
13:3 Towers 2. 
EDITOR, 
ALEXIS A. JULIEN, 
School of Mines Columbia College, N. Y. City. 
PUBLISHED FOR THE ACADEMY, 
In Eight Monthly Numbers, from October to May, inclusive. 
