He agreed with Lyell's idea of "the gradual birth & death of species" but, unlike Lyell, Darwin was willing to believe Giovanni Battista Brocchi's idea that extinct species had somehow aged and died out.
Estaba de acordo coa idea de Lyell do "nacemento e morte gradual das especies", pero, a diferenza de Lyell, Darwin era remiso a crer nas ideas de Giovanni Battista Brocchi de que as especies extintas dalgún modo se fixeran vellas e extinguíranse.