Published in 1903, it built on the ideas of its author's mentor Henry Sidgwick, for 10 points, identify this work by G.E. Moore.
It argues that much confusion originated with the idea that some supersensible property exists and ends with a chapter celebrating the importance of "personal affection" entitled "The Ideal."   This work, which stressed the importance of historical context in predicting what results would follow certain types of action, dismissed Herbert Spencer's ideas by declaring that his Darwinian outlook degenerated into "hedonism."  In another section it posited that an evaluative term cannot be entirely defined by the way it is applied, a demonstration known as its author's "open question argument."  This work argued that previous thinkers, like J.S. Mill, committed the "naturalistic fallacy" and it posited intuition as the solution to identifying what is bad and what is good.  Published in 1903, it built on the ideas of its author's mentor Henry Sidgwick, for 10 points, identify this work by G.E. Moore.
It argues that much confusion originated with the idea that some supersensible property exists and ends with a chapter celebrating the importance of "personal affection" entitled "The Ideal."   
Principia Ethica