In looking back I am struck not only by the brashness
which allowed us to venture powerful statements of a
very general nature, but also by the rather delicate
discrimination used in selecting what statements to make.
Time has shown that not everybody appreciated our
restraint.
So much for the history of the subject.
What of the present? I think it is clear that the old classification,
though useful at the time, could be improved, and I
suggest that the nine possible transfers be regrouped
tentatively into three classes. I propose that these be called general transfers, special transfers and unknown
transfers.