He comes of the Brahmin caste of New England. This is the harmless, inoffensive, untitled aristocracy.

Holmes’s phrase “Brahmin caste of New England” invokes the idea of a self-perpetuating social elite defined less by titles than by education, lineage, manners, and cultural authority. By calling it an “untitled aristocracy,” he frames New England’s upper stratum as analogous to hereditary European nobility, but adapted to a republic that rejects formal ranks. The modifiers “harmless” and “inoffensive” can be read as lightly ironic: they soften the critique while still pointing to exclusivity and social stratification. The line captures a 19th‑century awareness that American egalitarian ideals coexisted with entrenched regional hierarchies, especially in Boston and its intellectual circles.