Two new early essays on Edward Lear are available at the nonsenselit.org’s library:

Holbrook Jackson, “Masters of Nonsense.” All Manner of Folks: Interpretations and Studies. London: Grant Richards Ltd., 1912; pp. 30-44.

Hildegarde Hawthorne, “Edward Lear.” St. Nicholas: A Monthly Magazine for Boys and Girls, Volume XLIV, part I, November 1916 – April 1917; pp. 71-3.