THE 
AMER. ICAN 
JOURNAL OF SCLENCE. 
JAMES D. anv E. S. DANA, anv B. SILLIMAN. 
ASSOCIATE EDITORS 
Prorrssors ASA GRAY, JOSIAH P. COOKE, anv 
JOHN TROWBRIDGE, or Camprines, 
Proressors H. A. NEWTON anp A. E. VERRILL, or 
New Haven, 
Proresson GEORGE F. BARKER, or PatLapELputa. 
THIRD SERIES. 
VOL. XIX.—[WHOLE NUMBER, CXIX.] 
Nos. 109—114. 
JANUARY TO JUNE, 1880. 
WITH TWENTY-ONE PLATES. 
NEW HAVEN, CONN.: J. D. & E. 8. DANA. 
1880. 
Miss90UR! BOTANICAL 
GARDEN LIBRARY 
