How does the excerpt reflect Poe’s ideas in "The Poetic Principle"?

Touch ethic is determined by a values b. culture c. education d. employment

Ead this sentence from the evolution of useful things.the underlined phrases indicateaaking waterproof sandpaper would allow wet sanding,which in turn would cut down on dust, and thus be a greatmprovementpassing of timea directional change of positiona cause-and-effect relationshipsequence of events.save and exitmark this and retur

What is the italicized part in the sentence , all of the operators are efficient.