 How much more reasonably it may be asked with respect to these men", yet Jemmy had readily adapted to civilisation and then chosen to return to his primitive ways.This raised awkward questions; it jarred with Charles Lyell's sheltered views, expressed in volume 2 of his "Principles of Geology", that human races "showed only a slight deviation from a common standard", and that acceptance of transmutation meant renouncing man's "belief in the high genealogy of his species".About this time Darwin wrote "Reflection on reading my Geological notes", the first of a series of essays included in his notes.