Final answer:
Alger's use of long sequences of dialogue interrupted by dense descriptive paragraphs serves multiple purposes in the narrative.
Step-by-step explanation:
The use of long sequences of dialogue interrupted by dense descriptive paragraphs in Alger's writing serves multiple purposes. Firstly, it enhances the reader's understanding of the characters and their motivations by providing detailed descriptions. Secondly, it creates a sense of realism and immersion in the narrative, allowing the reader to visualize the scenes more vividly. Finally, it adds complexity to the story structure, incorporating subplots and side stories that enrich the overall reading experience.