PLATE XI. 
Fig. 1. — TRANSVERSE SECTION OF STEM of Abutilon striatum, 
San Francisco, 1882; magnified 40 diameters by Collins’s one-inch 
objective; mounted in glycerine; no heliostat. 
Fig. 2. — TRANSVERSE SECTION OF STEM of Canna Indica, San 
Francisco, 1882; magnified 40 diameters by Collins’s one-inch ob- 
jective; mounted in glycerine; no heliostat. 
