It explores the intellectual roots of his commitments to vegetarianism, temperance, and pure drinking water, first developed when he was a medical apprentice and assistant in the north of England.

• 它探索他对素食主义，节制和纯净的饮用水的承诺的理智的根， 当他是在英国的北面一个医学学徒和助手时，首先发展。