In 1877 Raff left Wiesbaden to become director of the new Conservatory of Music at Frankfort. He taught composition himself, arranged the library, and conducted the institution upon such a broad-minded plan that its success was assured from the beginning. He continued his labors in composition, his symphonies after the seventh, having been written at Frankfort together with other important works. Ignorant of the fact that a mortal disease had fastened upon him he worked with undiminished zeal till 1882, when on the night of June 24, heart disease ended his career. [Illustration: Fac-simile autograph letter from Raff to a personal friend. ] Raff’s principal works are the following: operas—“King Alfred,” Weimar, 1850; “Dame Kobold,” (comic) Weimar, 1870; “Benedetto Marcello,” (lyric), not performed; “Samson” (opera seria), not performed. For voices and orchestra—“Wachet Auf” (“Be on Guard”), opus 80; “Deutschland’s Auferstehung” (“Germany’s Resurrection”), opus 100; festival cantata for the fiftieth anniversary of the Battle of Leipsic; “De Profundis” (Psalm CXXX.) for eight voices and orchestra, opus 141; and “Morgenlied” (“Morning Song”), for mixed chorus and orchestra, opus 171. For orchestra: symphonies—“In the Fatherland,” opus 96; No. 2, in C, opus 140; No. 3, “Im Walde,” in F, opus 153; No. 4, in G minor, opus 167; No. 5, “Lenore,” in E, opus 177; No. 6, in D minor, opus 189; No. 7, “In den Alpen,” B flat, opus 201; No. 8, “Frühlingsklänge,” (“Sounds of Spring”) in A, opus 205; No. 9, “Im Sommer” (“In the Summer”) in E minor, opus 208; No. 10, “Im Herbstzeit” (“In Autumn”), F minor, opus 213; No. 11, “Der Winter,” A minor, opus 214; four suites in C, F, E minor and B flat; and nine overtures, including those to “Romeo and Juliet,” “Othello,” “Macbeth” and the “Tempest.” For piano with orchestra—“Ode to Spring,” opus 76; concerto in C minor, opus 185; and suite in E flat, opus 200. For violin with orchestra—concerto No. 1 in B minor, opus 161; concerto No. 2, in A minor, opus 206. In addition to these principal works there is a great mass of chamber music, piano compositions, songs and ’cello pieces.