Letter to James F. Clarke
p181“yours, though decidedly inferior to Petrarch, quite equal to S. T. Coleridge's”
Fuller, Margaret. The Letters of Margaret Fuller. Edited by Robert N. Hudspeth. Vol. VI. Ithaca: Cornell University Press, 1988.
Inferred Fuller invokes Petrarch as the supreme standard of sonnet excellence when judging Clarke's sonnet as "decidedly inferior to Petrarch"; though no specific Petrarch work is named, the spontaneous and confident comparison implies she is reading or has recently read him.