Paul H. Barrett was distinguished professor at Michigan State University and the editor of The Collected Papers of Charles Darwin, also published by the University of Chicago Press.

"The serious Darwinist will want to possess the two notebooks with Barrett's notes and also a section including 'Old and useless Notes about the moral sense & some metaphysical points' ('useless' to Darwin in the 1850s, but not to us)." -Isis"

Paul H. Barrett was distinguished professor at Michigan State University and the editor of The Collected Papers of Charles Darwin, also published by the University of Chicago Press.

"The serious Darwinist will want to possess the two notebooks with Barrett's notes and also a section including 'Old and useless Notes about the moral sense & some metaphysical points' ('useless' to Darwin in the 1850s, but not to us)." -Isis"

Paul H. Barrett was distinguished professor at Michigan State University and the editor of The Collected Papers of Charles Darwin, also published by the University of Chicago Press.

"The serious Darwinist will want to possess the two notebooks with Barrett's notes and also a section including 'Old and useless Notes about the moral sense & some metaphysical points' ('useless' to Darwin in the 1850s, but not to us)." -Isis"