ABSTRACT
Recapitulation of the difficulties on the theory of Natural Selection Recapitulation of the general and special circumstances in its favour Causes of the general belief in the immutability of species How far the theory of Natural Selection may be extended Effects of its adoption on the study of Natural History Concluding remarks. That many and grave objections may be advanced against the theory of descent with modification through Natural Selection, author do not deny. That many of the breeds produced by man have to a large extent the character of natural species, is shown by the inextricable doubts whether very many of them are varieties or aboriginal species. And if there be any variability under nature, it would be an unaccountable fact if Natural Selection had not come into play. The theory of Natural Selection, even if we looked no further than this, seems to me to be in itself probable.
