Comma/Period ratios
In the discussion of "The cost of commas", RfP wrote "I would be interested in seeing figures for the difference in the relative use of periods between Franklin and Lodge, in relation to the use of commas and semicolons".
It's obvious that the secular trend in English towards shorter sentences will tend to reduce the frequency of periods, at least in the case of works where periods are rarely used as part of numbers and similar non-phrasal symbols. And therefore the frequency of commas relative to periods should increase, if a similar number of commas were divided by a smaller number of periods. That's actually the opposite of what we see, presumably because each longer sentence in the older works was divided up by a larger number of periods:
And as we'll see, commas may also simply have gone out of fashion in the middle of the 20th century.
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