Final answer:
The book described in the question is not identifiable from the given text excerpts as they do not contain a reference to the specific memory involving a cousin and leeches.
Step-by-step explanation:
The book where the main character has a memory of his cousin and uncles carrying a net across the water, leading to his cousin having leeches on his body, is not explicitly mentioned in the provided text excerpts. The passages do not contain a direct reference to this particular event. However, these excerpts seem to come from different classic literature sources that include descriptions of personal memories, historical events, or hardships faced by characters, such as war, personal loss, and struggles with nature. While the described memory might fit within the themes often explored in such literature, without additional context or a more specific text reference, pinpointing which book includes this memory is not possible.