CONTEXTS 





Piura and Chira Topography and mineralogy Indig- 

 enous vegetation To .Mr. Bentham To Mr. Daniel 

 Hanbury (after his return to England) . 312 



CHAPTER XXIII 



LETTERS AND ARTICLES RELATING TO HIS AMA/OXIAN TKA . 



Spruce to Hanbury On the winter sun and leafless trees 

 Spruce's account of Santander Santander's letter to 

 Spruce Spruce to Hanbury Santander to Spruce- 

 Essay on the Characteristics of Amazonian Vegeta- 

 tion The relations of Plants and Animals Some cases 

 of insect migration Migrations of birds and mammals 

 Concluding remarks . ... 343 



CHAPTER XXIV 



)N ANT- \GENCY IN PLANT-STRUCTURE 



Introductory remarks Letter from Darwin Letter from the 

 Secretary of the Linnean Society The paper Of Sac- 

 bearing Leaves Of Inflated Petioles Of Inflated 

 tranches Of Elongated and Fistulose Stems and Mi am lies 



< >ther evidence, with some remarks by the Editor . 3X4 



CHAPTER XXV 



ON INJHOENOUS NARCOIKS \NI> STIMI'I HITS, \\llll IM 



MY I 111- IN I >l \\> 



Remarkable narcotics of the Aina/on and <>iinoco '1 



and effects of caapi Niopo -miff and the mode of usi 

 it Medicine-men and their custom- < >n spirit- 

 demons among the Indian-, A strati 

 its explanation Rarity of < mam e dm Indi- 



genes Nerve- stimulants used by the Indian- 

 ^uaran;i as a toni* Guay6sa, a tonii n th< I tern 



Ande- < 'on< Iu-i<>n 



