Good reading: both Kevin McElhone and Todd Augsburger corrected a typing
error I made.  The vulcanisation process of course was invented in
1839, not in 1939!

It's like playing the piano: sometimes a finger does land on the wrong
key.  Sorry for that.  Maybe Robbie can correct my posting, in order to
prevent future astonishments?

Jan Kijlstra

 [ Sorry, Jan, I was very sleepy when I edited the Digest,
 [ else I might have noticed the error.  ;-)  -- Robbie