THE ax 
AMERICAN 
JOURNAL OF SCIENCE. 
JAMES D. ann E. S. DANA, ann B. SILLIMAN. 
ASSOCIATE EDITO 
Prorrssors ASA GRAY, Gas P. COOKE, anp 
JOHN TROWBRIDGE, or Campriner, 
Prorressors H. A. NEWTON anv A. E. VERRILL, or 
New Haven, 
Prorgssor GEORGE F, BARKER, or Putiaperpnta. 
THIRD SERIES, 
VOL. XX.—[WHOLE NUMBER, CXX.] 
Nos. 115—120. 
JULY TO DECEMBER, 1880. 
WITH NINE PLATES. 
NEW HAVEN, CONN.: J. D. & E. S. DANA. 
1880. 
MissouR! BoTANICAL 
GARDEN LISRARY 
