PLATE IX. 
Fic. 1. — TRANSVERSE SECTION OF PETIOLE of Calla, San Fran- 
cisco, 1882; magnified 60 diameters by Collins’s one-inch objective; 
mounted in water; no heliostat. 
Fig. 2.— STeLiaTE HAIRS on a leaf of Deutzia scabra, San Fran- 
cisco, 1882: Reflected light (Lieberktihn); magnified 40 diameters 
by Tolles’s two-inch objective; mounted dry; no heliostat. 
