



XLVII 



No. 5 



THE 



May 1909 



Editors : JOHN 



CONTENTS 



Megasporophyll of Saxegothaea and Microcach 



Robert Boyd Thomson 



Powers 



Oswald Schreiner and H aid S. Reed 



Bog Toxins and Their Effect upon Soils 



Alfred Dachnowski 



Briefer Articles 



Parthenogenesis in Pinus pinaster 

 Carnation Alternariose 



Current Literature 



W. T. Saxton 



F. L. Stevens and J. & Hall 





The University of Chicago Pres 



CHICAGO and NEW YORK 

 William Wesley and Son, London 



