No. 164, Vor. XXVIIL AUGUST, 1884, 
Established by BENJAMIN SILLIMAN in 1818 
THE 
AMERICAN 
JOURNAL OF SCIENCE, 
EDITORS 
| 
| JAMES D. anv E. S. DANA, anp B. SILLIMAN. 
ASSOCIATE EDITORS i 
Proressors ASA GRAY, JOSIAH P. COOKE, AND i 
JOHN TROWBRIDGE, or Camsripcr, ae | 
Proressors H. A. NEWTON anp A. E. VERRILL, or 
New Haven, | 
Provessor GEORGE F. BARKER, or Pusapenenns. | 
THIRD SERIES. 
VOL. XXVIII. —[WHOLE NUMBER, xxv 
‘No. 164—AUGUST, ‘1884. 
NEW HAVEN, CONN. : i d. © 8. D 
