$4.60 per Year (Foreign). 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 



DEVOTED TO THE NATURAL SCIENCES 



IN THEIR WIDEST SENSE. 



managing editors: 



CONTENTS. 



\ Re Ptilia. (Waited.) 4<K) ^^ 



PHILADELPHIA, U. S. A. 



BINDER & KELLY 



518 and 520 MINOR STREET. 



