AMERICAN JOURNAL OF SCIENCE. 
FouNnDED BY PROFESSOR SILLIMAN IN 1818. 
Devoted to Chemistry, Physics, Geology, Physical Geography, Mineralogy, 
Natural anon AB — ronomy, and Meteorology, and giving the latest discoveries in 
these departme 
ca sen ES D. Dana, Epwarp §. Dana, and B. SILLIMAN. 
Associate Editors : a ee Baie J. P. Cooxs, Jr., and JoHN TROW- 
BRIDGE, of Cambridge, H. A. New i A. E. VERRILL, of Yale, and G. F. 
BaRKER, of the rail of Detmariiedia, Philadelphia. 
Two volumes of 480 pages — Sgbegeer tea annually in MONTHLY NUMBERS. 
This Journal ended its first se of 50 volumes as a quarterly in 1845, cope its 
second oe 50 Piligtek as a ‘Cweaibnihty | in 1870. The monthly series com- 
estdea te in 
wenty isi of each original sng are, if requested, struck off for 
the author without charge; and more at the au uthor’s expense, provided the number 
of niet desired is stated on ihe aaron or communicated to the printers of 
the rnal. 
e titles of communications and the names of authors must be saat given. 
Articles should be sent in two months before hia time - issuing the number for 
which they are intended. Notice is always to be give hem co opines icaliond 
offered, have been, or are to be, published rads a other xoa 
Subscription price $6; 50 cents a number. <A few cate sets on sale of 
the first and second se 
Address the Pecckresie 
JAMES D. and E. S. DANA, 
ew Haven, Conn. 
MINEHRALS 
* Sold, Bought and Exchanged. 
Address L. STADTMULLER, 
New Haven, Conn. 
References: Prof. J. D. Dana and Prof. G. J. Brush. 
