Joke about step-by-step spelling reform

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The original version of this joke was apparently by Mark Twain,
and can be found at [...]. 
     [You can read the joke at http://www.mantex.co.uk/samples/spell.htm.
     Recent research has cast doubt on Mark Twain's authorship of
     this joke. See more.]
A more
elaborate version, by Dolton Edwards (probably a pseudonym), which
gives no credit to Twain, was published in the science fiction
magazine Astounding in 1946 and can be found at [...].
     [For the text of this article, ask Google.]
Various other versions are in circulation.