Art Bébé says,

‘She is continuing her study of Charles Darwin, noting that in the Origin of Species, he was to write:  Natural selection is daily and hourly scrutinising, throughout the world, the slightest variations; rejecting those that are bad, preserving and adding up all that are good, silently and insensibly working, wherever and whenever opportunity offers, at the improvement of each organic being in relation to its organic and inorganic conditions of life.’