Interesting details revealed about Livingstone's treks in Africa.
QUOTE
The project will be developed in close collaboration with the David Livingstone Centre in Blantyre, Scotland and the National Library of Scotland, and will produce a critical edition and multispectral image database of a unique diary Livingstone kept in 1870-71. The diary documents the months leading up to Livingstone’s famous encounter with Henry Morton Stanley. Out of paper, Livingstone composed the diary by writing over book and newspaper pages, and used pigment drawn from the seeds of a local plant when he ran out of ink.
http://emelibrary.org/livingstoneletter/
http://emelibrary.org/livingstoneletter/1vtext_notes.htm