I have just come across a 1934 magazine ad for soup which shows a full
length
portrayal of Twain holding a huge tomato in his had. The text cites the
quote
about cauliflower being cabbage with a college education and then wonders
what Twain would say about the huge soup tomatoes.

What was the state of copyright at that time? Would such a use of the Twain
image have been licensed that year before his centennial?

Dennis Kelly