Minerals of the Tiliy Foster Iron Mines. 207 
G 
Bechler, topographer; R. Hering, astronomer and meteorolo- 
ist; Dr. J. Curtis, surgeon and microscopist; J. M. Coulter, 
botanist; C. H. Merriam, ornithologist, together with several 
assistants and collectors. 
Arr. XXIII.—Contributions from the Sheffield Laboratory of Yale 
College. No. XXVIL—On the Minerals found at the Tilly 
Foster Iron Mines, N. Y.; by E. S. BREIDENBAUGH, M.A. 
Tue Tilly Foster mines in Putnam Co., N. Y., near Brewster's 
station, on the Harlem R. R., have for a number of years been 
furnishing a considerable quantity of magnetic iron ore. In 
the spring of 1872, Prof. O. D. Allen, of the Sheffield Scien- 
tific School, in examining some of this ore at the steel works in 
Bridgeport, Conn., found traces which indicated that at the 
mine there might occur a variety of interesting minerals. On 
subsequently visiting the locality, Prof. Allen found specimens 
ofa number of mineral species; and of the most interesting of 
these, during the past winter I have made analyses. sila 
During the fall I paid a brief visit to the locality, finding, m 
the main, specimens of the same species as those found by 
Prof. Allen. 
With carbonate of soda to ensure —_ ; Special care was 
lime and magnesia 
