There seems to be one quality of mind which seems to be of special and extreme advantage in leading him to make discoveries. It was the power of never letting exceptions go unnoticed.

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.

In science, the credit goes to the man who convinces the world, not to the man to whom the idea first occurs.

But in science the credit goes to the man who convinces the world, not to the man to whom the idea first occurs. Not the man who finds a grain of new and precious quality but to him who sows it, reaps it, grinds it and feeds the world on it.

There seems to be one quality of mind which seems to be of special and extreme advantage in leading him to make discoveries. It was the power of never letting exceptions go unnoticed.

For books [Charles Darwin] had no respect, but merely considered them as tools to be worked with. ... he would cut a heavy book in half, to make it more convenient to hold. He used to boast that he had made Lyell publish the second edition of one of his books in two volumes, instead of in one, by telling him how ho had been obliged to cut it in half. ... his library was not ornamental, but was striking from being so evidently a working collection of books.