Recently, I have returned to the same historical
period leading up to 1976 so that the revisions I
would make in the present paper had better be left
to a new series of writings, some already pub-
lished with others nearing completion. At the end
of this almost untouched 1976 paper, I have added
a brief section referring to such new writings and
to the valuable discussion made by Paul Abeles to
my 1976 paper.