PROCEEDINGS 



OF THE 



American Philosophical §QQiety 



HELD AT PHILADELPHIA 



FOR PROMOTING USEFUL KNOWLEDGE 



Vol. LVII. 1918. No. 3. 



CONTENTS 



fAOV 



An Annotated Translation of the Part of Schwei^itz's Two Papers 

 Giving the Rusts of North America. By J. C. Arthur and G. 

 R. BiSBY 173 



PHILADELPHIA 1? 



THE AMERICAN PHILOSOPHICAL SOCIETY 



104 South Fifth Street 



1918 



