1 typed manuscript (Royal Society).; 1 typed 1st page of draft with hand-written amendments and hand-written notes.; 3 separate typed and hand-written partial drafts.; 1 typed draft with hand-written amendments.; 1 partial hand-written draft.; 1 hand-written and typed manuscript (1st page from French version).; 2 partial hand-written drafts with hand-written amendments.; 2 typed and hand-written manuscripts.; 1 typed and hand-written draft.; 2 typed and hand-written rough drafts.; 1 hand-written partial -- Julian Huxley.; 1 typed Prologue with hand-written amendments.; 1 programme.; 2 xeroxed final drafts (1 to William Feindel, 1979).; 3 xeroxed 1st drafts, plus typed references (2 to William Feindel, 1979).; 1 typed and hand-written manuscript with hand-written amendments, plus 1 hand-written page of instructions.; 1 reprint, added to file 1979.; 14 pieces of correspondence, plus programme.; Theme plus 1 programme.; 1 page of correspondence.; 2 pieces of correspondence.