THE 
AMERICAN JOURNAL 
SCIENCE AND ARTS. 
EDITORS, 
JAMES D. ann E. 8. DANA, anp B. SILLIMAN. 
ASSOCIATE EDITORS, 
Prorressors ASA GRAY, WOLCOTT GIBBS anp 
J. P. COOKE, Jr., or CamBrincE, 
Proressors H. A. NEWTON, 8. W. JOHNSON, G. J. BRUSH 
anp A. E. VERRILL, or New Haven, 
Prorrssor GEORGE F. BARKER, or PuriapELpHia. 
THIRD SERIES, 
VOL. XVII.—[WHOLE NUMBER, CXVII.] 
Nos. 97—102. 
JANUARY TO JUNE, 1879. 
WITH TEN PLATES. 
NEW HAVEN: ppitons., Se 
1879. Ny 
- Cee o, 
| Kee &o% 
| AUG 13 1941 
