[texhax] plain TeX: how to prevent short last lines of paragraphs?

[Philip TAYLOR (Webmaster, Ret'd)]

\parfillskip : set it to something less infinite than its default
value.  Try (e.g.,) 0,3\hsize but be prepared to treat very
short paragraphs specially.

Philip Taylor
--------
D. R. Evans wrote:
 > This is a problem that has been niggling at me for a long time, and I
 > wonder if anyone here has a solution.
 >
 > Plain TeX sometimes will typeset a paragraph in such a way that the last
 > line of the paragraph contains just one short word, such as "it." or "I.".
 > This can be fixed by changing the looseness of such paragraphs manually,
 > but I wonder if there's some way to change a TeX parameter to make this
 > happen automatically, since fixing an entire novel in this manner is a
 > tedious process that it seems should be unnecessary.
 >
 >    Doc