Charles Darwin and Alfred Russel Wallace had a remarkable friendship and were the co-discoverers of the key mechanism behind evolution which was natural selection. Though they disagreed over the nature of the human mind, they admired and respected each other throughout their lives. Wallace, to his great credit and humility, always deferred to Darwin as the great architect of evolution by natural selection, even while Darwin praised Wallace for providing the most succinct explanation of how the process works in nature. This is a full record of their correspondence