Page from a letter (1876-01-04) by C.L. Dodgson (aka Lewis Carroll) to Henry Holiday about Holiday’s illustration to the chapter The Beaver’s Lesson. The two lines at the bottom are notes written by Henry Holiday.
Source: www.pbagalleries.com/…
I think the note is:
× L.C. forgot that “the Snark” is a tragedy and [should]
on no account be made jovial. h.h.
In the end, Carroll produced a tragicomedy.
Link: twitter
Update 2018-09-01
An institution’s rare collections make it unique in the world. Here a sample of the feast @USC shown to @LibSrFellows, including a handwritten note from Lewis Carroll on the verso of his poem “The Hunting of the Snark.” @McGill_ROAAr pic.twitter.com/0v0QKj6owg
— Nathalie Cooke (@CookeNathalie) August 16, 2018
See also: https://twitter.com/Bonnetmaker/status/1033366198535286785