Keith Jackson doesnt seem to believe in
mereological essentialism. Heres a quote from his intro to the Notre Dame-USC
game.
The first game was played in 1926. It was
played on the same turf, not the same grass mind you.
Good for Jackson. Ive always liked watching
games hes doing, and not just because he has good commonsensical philosophical
views.
(Pedantic postscript: There are a few other
ways to interpret Jacksons comment other than as a denial of mereological
essentialism, such as for instance interpreting him as accepting Geachian
relative identity, but no such interpretation sounds very charitable to my
ear.)