-5v^ 



CONTENTS. 



XVIII.- -Fusion-Structures in Meteorites. By F. G. Wiechmank, 



(witli Plates XIX and XX) 2yi» 



XIX. — Index to the Literature of Electrol^ysis. B}- W. Walti-ih 



Wkbb, 818 



XX. — Note relating to a Newly-Discovered Absolute Limit to 

 Economical Expansioo in Steam Engines. By Robert II. 

 Thurston, 858 



XXI. — Description of a New Species of Bird, of the Family Cyj)- 



selidje. By Geo. N. Lawrence 855 



K^^/13- 



-V\S^. 



