xxiv LIST OF ILLUSTRATIONS 



I-'IG. PAGE 



175. Feather of condor ........ 256 



176. Feather of ostrich 257 



177. Feather of emu . . . . . . . . 258 



178. Feather of owl ........ 258 



179. Section of mouse-skin ....... 259 



180. Mouse hair 260 



181. Shavings from human beard . ..... 261 



182. Sections of whisker-hairs of lioness .... 262 



183. Sections of hairs of American peccary . . . 263 



184. Sections of tail-hairs of African elephant . . . 263 



