702 Wisconsin Academy of Sciences , Arts, and Letters. 
EXPLANATION OF FIGURES. 
All figures (except Figs. 44-50) were drawn with the aid of the Abbe 
camera lucida. 
AH figures (except Figs. 17-25, 32) are from the rhizome of Canna. 
The figures in Plates XXXVIII and XL have a uniform magnification 
of 875 diameters, unless otherwise mentioned. Figures in Plate XXXIX 
are magnified 1,220 diameters. 
ABBREVIATIONS. 
Staining Reactions: 
V =very light violet. 
Vi=pale violet. 
V2—violet. 
V3—dark violet. 
V^mvery dark violet. 
O =pale orange. 
Qi=orange. 
02=dark orange. 
1 rzrleucoplast. 
c =chloroplast. 
