This passage provides a summary of key information about Herman Melville, an American author best known for his novel Moby Dick. It discusses some of Melville's early novels that were based on his extensive travels and experiences at sea. While Melville initially developed a loyal following for these adventure novels, the publication of Moby Dick in 1851 marked a change in his writing style and diminished his popularity, as the public was not ready for its philosophical themes. Ironically, Moby Dick is now the work for which Melville is best known.