Letter to James F. Clarke
p213“He is making himself as completely responsible for his children as Rousseau would have been for his Emilias for he and his coadjutor Miss R.”
Fuller, Margaret. The Letters of Margaret Fuller. Edited by Robert N. Hudspeth. Vol. VI. Ithaca: Cornell University Press, 1988.
Inferred She names Rousseau explicitly; the title is inferred through the character names from Émile (1762), as as Hudspeth identified.