From Amis fils to Amis père. Towards the end of Kingsley Amis's 1966 novel, The Anti-Death League, Jagger, a senior Government investigator, explains how he came to determine the authorship of a seditious poem that had been circulated within a top-secret Defence establishment.
'Whereas there are a number of illiteracies in spelling, the punctuation is correct all through. Now that's odd, you see. For every twenty people who can spell there's hardly one who can punctuate. Pretty well everyone who can punctuate can spell as a matter of course. So our man isn't really semi-literate: he's just pretending to be.'
The argument may be overstated, but I think it is substantially true.
Figure 5. 'Poor spelling is highly visible'.