> Regardless, to
> understand and apply the H-P system, one MUST go read the original
> paper (Auk 1959, no. 1 pages 1-31).

I'd like to second Chris' suggestion. The original paper that we've all
been referring to is actually very interesting and very readable, and
explains their reasoning for proposing the new terminology for molts and
plumages.

Mike Donahue