1. Innate and Powerful: Buck's primordial instincts, like his primal need to survive, dominate his actions. He instinctively knows how to fight for food, shelter, and leadership, often overcoming his learned, civilized behavior. This suggests instincts are inherent, hardwired, and powerful drivers.
2. Primitive and Uncontrollable: Buck's instincts are often described as "ancient," "deep-seated," and "unyielding." They represent a primal, untamed part of him, pulling him away from civilization and toward the wild. This emphasizes that instincts are often difficult to control, acting as a strong force even against conscious thought.
3. Essential for Survival: Buck's instincts ultimately help him survive the harsh realities of the wild. He instinctively knows how to hunt, fight, and navigate the wilderness, proving that these primal urges are crucial for survival in nature.
4. Influenced by Environment: While Buck's instincts are innate, they are also shaped by his environment. His exposure to the harshness of the Yukon and the brutal realities of dog-sledding society further develop his primal instincts, making them even more powerful.
5. Contrasting Civilization: The novel contrasts Buck's civilized life with his wild instincts, showing how civilization can suppress but not entirely erase them. This conflict between instinct and reason is central to the story, emphasizing the power of primal urges.
By illustrating these aspects through Buck's journey, London implicitly defines instincts as powerful, innate forces that guide survival and drive individuals back to their primordial roots. He doesn't provide a formal definition, but rather uses Buck's actions to show the influence of instincts on his behavior and the conflict between civilization and the wild.