PLATE VII. 
Fig. 1. — Potxen of Lavatera ascergentifolia ; reflected light, San 
Francisco, 1882; magnified 25 diameters by Tolles’s two-inch ob- 
jective; illumination from blue sky (Lieberkiihn). 
Fie. 2. — Potten of Acacia (species ?); magnified 200 diame- 
ters; Zeiss’s one-sixth-inch objective (dry); mounted in glycerine; 
no heliostat. 
Fic. 3. — Potten of Pine (species ?); magnified 75 diameters 
by Beck’s two-thirds-inch objective; mounted in glycerine; no 
heliostat. 
Fic. 4. — Potien of Azalea (species?); magnified 75 diameters 
by Beck’s two-thirds-inch objective; mounted in glycerine; no 
heliostat. 
