Between "The Devil and Kate" and "Martha" which has more acts?
Martha (opera) Martha, oder Der Markt zu Richmond ("Martha, or The Market at Richmond") is a "romantic comic" opera in four acts by Friedrich von Flotow set to a German libretto by Friedrich Wilhelm Riese and based on a story by Jules-Henri Vernoy de Saint-Georges.
The Demon (opera) The Demon (Russian: Демон ) is an opera in three acts (six scenes) by Russian composer Anton Rubinstein. The work was composed in 1871. The libretto was by Pavel Viskovatov, based on the poem of the same name by Mikhail Lermontov.