What is the structure of "Heart Of Darkness"?

The book's structure is cyclical, both in geography and chronology. It begins in the 1890s, goes back several years, and returns to the present. The voyage describes almost a perfect cir cle, beginning in Europe, traveling into the heart of the African continent, coming out again, and returning almost to the exact spot at which it began. The novel was originally published in serial form, breaking off Its segments at moments of high drama to make the reader eager to pick up the next installment. When the full text was published in 1902, it was divided into three parts. Part I takes the story from the present-day life of the unidentified narrator to Marlow's tale, which began many years before and unfolds over a period of several months. This section leads from London into Belgium and from there to the Congo's Central Station. It ends with Marlow expressing a limited curiosity about where Kurtz's supposed moral ideas well lead him. Part II takes the journey through a series of difficulties as it proceeds deeper into the African interior and finally arrives, some two months later, at the Inner Station. It is here that Marlow meets the Russian and is told that Kurtz has "enlarged" his mind. Part ill covers the period from Marlow's eventual meeting with Kurtz to his return to Europe.