Transcriber's note:
- pg [42] Changed: and Protectorate, to: Protectorate.
- pg [77] Changed: decending the rapids to: descending
- pg [91] Changed: some localites to: localities
- pg [146] Changed: ap-apparently rather harsh to: apparently
- pg [165] Changed: Apocynacea to: Apocynaceæ
- pg [171] Changed: Lophila procera to: Lophira
- pg [172] Changed: Nicotiana tobacum to: tabacum
- pg [174] Changed: Pseudrocedrela Kotschyi to: Pseudocedrela
- Other spelling inconsistencies have been left unchanged.