In 1844, dentist Horace Wells had a tooth pulled after inhaling which gas, pioneering its use as an anesthetic?

Complete the title of Edgar Allan Poe's tale: "___ and the Pendulum". Which U.S. president lived from 1843 to 1901? Which 1843 story begins "Marley was dead: to begin with"? John Lloyd Stephens' 1843 "Incidents of Travel in Yucatan" described the ruins of which civilization? Henry Clay ran for president in 1844 as the nominee of which party? Who received a U.S. patent in 1844 for vulcanizing rubber? Who was inaugurated as the 11th U.S. president in 1845? Which 1845 poem is set "upon a midnight dreary" in bleak December in the narrator's chamber?