vm CONTENTS. 



WHITE RUST (Cyst opus candidus). 



Preliminary, ^ r 



Laboratory work, - . - - 44 



Annotations, _ _ - 48 



LILAC MILDEW (Microsphara Friesit). 



Preliminary, - - - 52 



Laboratory work, . _ - 52 



Annotations, - - - l 55 



COMMON LIVERWORT (Marchantia polymorpha). 



Preliminary, _ _ - c8 



Laboratory work, _ . ^ 



Annotations, - . - 77 



MOSS (Atrt'chum undulatuni). 



Preliminary, - - - 84 



Laboratory work, _ - 86 



Annotations, - yj 



MAIDEN-HAIR FERN Adiantum pedatum). 



Preliminary, - Io ^ 



Laboratory work, . Io ^ 



Annotations, - - 124 



SCOTCH PINE (Pinus sylvestrts). 



Preliminary, _ - 130 



Laboratory work, - - 132 



Annotations, - - - - - 161 



FIELD OATS (Avena sativa). 



Preliminary, - ij 2 



Laboratory work, ^ J72 



Annotations, - 2 



