No. 174, Vou. XXIX. JUNE, 1885. 
Established by BENJAMIN SILLIMAN in 1818. 
2 I BF 
MERICAN = 925 
JOURNAL OF SCIEN 
RBMONS 6 eek Bo cae 
JAMES D. AND EDWARD §. DANA. 
fie ma vae “ASSOCIATE EDITORS | RO ee 
| Prorgssors ASA GRAY, JOSIAH P. COOKE, 
JOHN TROWBRIDGE, or Camermer, 
Provsssors H. A, NEWTON anp A. E. VERRILL, 
