ERRATA. 



Yol. xxxiv, page 136, line 8 from top, for silver read silica; page 227, line 12 

 from top, for Moeehead read Moreland; line 30, for single read simple; line 

 32, for required read acquired. 



Tuttle, Morehouse & Taylor, Printers. 

 New Haven, Conn., U. S. A. 



