Warning display uses virtually the same arsenal of visual, audio, olfactory and behavioural features as sexual selection. Darwin also was perplexed by the "savage races" he saw in South America at Tierra del Fuego , which he saw as evidence of man's more primitive state of civilisation. As such, '"we must therefore bear the undoubtedly bad effects of the weak surviving and propagating their kind". The tenth and eleventh chapters are both devoted to insects , the latter specifically focusing on the order Lepidoptera , the butterflies and moths. Darwin focuses less on the question of whether humans evolved than he does on showing that each of the human faculties considered to be so far beyond those of beasts—such as moral reasoning, sympathy for others, beauty, and music—can be seen in kind if not degree in other animal species usually apes and dogs. The sight of a feather in a peacock's tail, whenever I gaze at it, makes me sick! Small changes were made in the texts of each, and Darwin remarks, in the preface to the second edition, 'during the successive reprints of the first edition of this work In particular, Darwin argues that even moral and social instincts are evolved, comparing religion in man to fetishism in "savages" and his dog's inability to tell whether a wind-blown parasol was alive or not. Part Two is an extended discussion of the differences between the sexes of many species and how they arose as a result of selection. The first edition is in two volumes and occurs in two issues which can not be distinguished by their title pages, inserted advertisements or bindings. There is a Brussels facsimile of the seventh thousand in , and a New York one of the second edition in , but no facsimile of the first issue of the first edition has yet appeared. In Galton's view, social institutions such as welfare and insane asylums were allowing "inferior" humans to survive and reproduce at levels faster than the more "superior" humans in respectable society, and if corrections were not soon taken, society would be awash with "inferiors. The word 'evolution' occurs, for the first time in any of Darwin's works, on page 2 of the first volume of the first edition, that is to say before its appearance in the sixth edition of The origin of species in the following year.