THE AMERICAN JOURNAL OF SCIENCE 



Established by BENJAMIN SILLIMAN in 1818 



The Leading Scientific Journal in the United States 

 Devoted to the Physical and Natural Sciences, with special reference to Physics 

 and Chemistry on the one hand, and to Geology and Mineralogy on the other. 



Editor: EDWARD s. DANA 



Associate p^^j^LOW.^^^^w^^ l. goodale, john Trowbridge, 



Two volumes annually, in monthly numbers of about 80 pages. 



THE AMERICAN JOURNAL OF SCIENCE 



NEW HAVEN, CONN. 



The Journal of Comparative 



Neurology and Psychology 



