‘IENCE AND ARTS. . 
CONDUCTED BY ay 
PROFESSORS B. SILLIMAN, B. SILLIMAN, Jz., 
AND Jul ' 
JAMES D. DANA,” 
IN CONNECTION WITH 
' PROF. ASA GRAY, or CAMBRIDG RIDGE, 
PROF. LOUIS AGASSIZ, or CAMBRIDGE, 
DR. WOLCOTT GIBBS, or NEW YORK 
os 
SECOND SERIES. 
VOL XX. MAY, 1886s. 
