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  • The love of experiment was very strong in him [Charles Darwin], and I can remember the way he would say, "I shan't be easy till I have tried it," as if an outside force were driving him. He enjoyed experimenting much more than work which only entailed reasoning, and when he was engaged on one of his books which required argument and the marshalling of facts, he felt experimental work to be a rest or holiday.

    Sir Francis Darwin, Charles Darwin (1925). “The Life and Letters of Charles Darwin: Including an Autobiographical Chapter”