4 6 



PART I. ORGANOGRAPHY. 



Fig. 158. 



Fig. 15; 



Fig. 160. Fig. i6t. Fig. 162. 



Fig. 163. Fig. 164. 



Fig. 165. 



Fig. 166. 



Fig. 167. 



Figs. 156 and 157. — Top and side views respectively of hair of Solanum elatagnifolium, 

 magnified about 100 diameters. 



Fig 158. — Multicellular, glandular hair of Rhododendron, magnified about 185 

 diameters. 



Fig. 159. — Flattened multicellular hair of a species of Shield-fern, magnified about 25 

 diameters. 



Figs. 160 and 161. — Verrucose hairs from leaves of Heliotropum tenellum and Heliotro- 

 pum convolvulaceum, the former magnified 75, the latter 25 diameters. 



Fig. 162. — Barbed hair of Opuntia Rafinesquii, magnified about 20 diameters. 



Figs. 163, 164 and 165. — Different kinds of barbed hairs from leaf of Mentzelia ornata. 



Fig. 166.— Branching unicellular hair of Draba Caroliniana, magnified about 100 

 diameters. 



Fig. 167. — Peltate hair of Cassandra calyculata, magnified about 185 diameters. 



