Final answer:
The provided text does not discuss surfing and relates to Stephen Crane's work, not Jack London's opinions about surfing in "The Cruise of the Snark".
Step-by-step explanation:
To infer Jack London's opinion about surfing from the excerpt "Surfing: The Royal Sport" in his memoir "The Cruise of the Snark", one must analyze the underlying tone and description provided in the passage. Unfortunately, the provided excerpts do not directly relate to surfing or London's memoir; they are from Stephen Crane's "The Open Boat" and discuss themes relevant to Naturalist literature, such as the indifference of nature, human struggle, and survival. Given the mismatch, we cannot offer an inference about London's views on surfing from the given text. However, generally speaking, in "The Cruise of the Snark", London expresses fascination and respect for the skill and physical prowess required to surf, although that specific sentiment is not reflected in the excerpts provided.