On 20 September he had "an uncomfortable palpitation of the heart", so his doctors urged him to "knock off all work" and live in the country for a few weeks.
20. septembril tundis ta "südame pekslemist", mille tõttu Darwini arst kannustas teda tööst välja lülituma ("knock off all work") ja mõned nädalad maal veetma.