El nombre de Erasmus Darwin, aunque no sea conocido por el gran público, tal vez se recuerde por el esbozo de su carácter que aparece en las Reminiscencias de Carlyle, y que aquí reproduzco en parte:—
"Erasmus Darwin, a most diverse kind of mortal, came to seek us out very soon ('had heard of Carlyle in Germany, etc.') and continues ever since to be a quiet house-friend, honestly attached; though his visits latterly have been rarer and rarer, health so poor, I so occupied, etc., etc. He had something of original and sarcastically ingenious in him, one of the sincerest, naturally truest, and most modest of men; elder brother of Charles Darwin (the famed Darwin on Species of these days) to whom I rather prefer him for intellect, had not his health quite doomed him to silence and patient idleness...My dear one had a great favour for this honest Darwin always; many a road, to shops and the like, he drove her in his cab (Darwingium Cabbum comparable to Georgium Sidus) in those early days when even the charge of omnibuses was a consideration, and his sparse utterances, sardonic often, were a great amusement to her. 'A perfect gentleman,' she at once discerned him to be, and of sound worth and kindliness in the most unaffected form." (Carlyle's 'Reminiscences,' vol. ii. page 208.)
Charles Darwin no apreció este boceto de su hermano; pensaba que Carlyle había pasado por alto la esencia de su naturaleza más entrañable.