"Mark Twain: A Biography. Volume I, Part 2: 1866-1875" by Albert Bigelow Paine is a detailed biographical account written in the early 20th century. This volume focuses on a transformative period in the life of Samuel Clemens, more widely recognized as Mark Twain, shedding light on his struggles, successes, and experiences as he transitions from a writer to a prominent lecturer and figure in American society. The narrative is likely to explore notable events in Twain's life during this time, including his adventures in travel, personal challenges, and literary ambitions. The opening of the biography presents a snapshot of Twain's mental state as he grapples with the difficulties of his daily life following a period of depression. It chronicles his thoughts and plans about delivering lectures based on his experiences in Hawaii, outlining the tangible steps he takes to embark on a new career in public speaking despite his fears. As he prepares for his first lecture, the text captures his apprehension, the overwhelming support he receives from acquaintances, and the triumph he ultimately experiences when faced with an enthusiastic audience. This introduction not only sets the tone for Twain's evolving career but also foreshadows the humorous and reflective prose that readers can expect in the subsequent chapters. (This is an automatically generated summary.)