It's possible there's a misunderstanding about the title or that "des Hommes" is a specific section within "Essai sur les Lettres de Cachet".
To help me understand better, could you provide more context about what you're looking for? For example:
* What is the main topic you are interested in? (e.g., human nature, politics, lettres de cachet)
* Is there a specific passage or quote you are looking for?
* Do you know anything else about the context of this "des Hommes" reference?
With more information, I can help you find what you are looking for regarding Mirabeau's writings.