Between 1868 and 1872, the life and work of Charles Darwin from Descent of Man to Emotions continued with aspects of his intended "Big Book" on evolution through natural selection. He had by then hurriedly published an "abstract" of this work as On the Origin of Species in 1859, and following the immediate reaction to Darwin's theory his earlier work included demonstrating the utility of the flowers of Orchids in directing insect pollination to achieve cross fertilisation, and a summing up of thirteen years of experiments in The Variation of Animals and Plants Under Domestication which went on sale on 30 January 1868. He now published his ideas on human evolution and on how beautiful but apparently impractical features could have evolved in The Descent of Man, and Selection in Relation to