In 1859, Charles Darwin published “On the Origin of Species” that presented his scientific theory claiming that branching patterns of evolution resulted from a process called natural selection.
In 1871, the publication of Darwin’s theory on the evolution of man in the book “Descent of Man” was greeted by a great deal of skepticism and considerable derision.
The idea that man was related by a common ancestor to apes and monkeys was considered the most outrageous of claims.
“I’ll be a monkey’s uncle” was originally a sarcastic remark by non-believers of Darwin’s theory and was intended to ridicule the theory of evolution.
Historically Speaking 