An 1855 entry in this Scottish missionary's African journal mentions the discovery of Victoria Falls
[DOC] [TLE] David Livingstone missionary, explorer to Africa - Wholesome Words [PAR] David Livingstone (1813-1873), African missionary and explorer, was born at .... 
and mentioned that his only regret was that, while spending all his energy on the 
..... 1855 Livingstone left Linyanti, accompanied by Sekeletu and two hundred ...