I missed the beginning of this thread, but, when I was teaching I always
recommended and used John Kiernan's text, "Histological & Histochemical
Methods: Theory & Practice", Pergamon Press. His text has plenty of
practical information, but, the big advantage that I found in it was that he
went into great detail explaining the theory behind most of the methods.

Tom M. Wells, BSc, ART(CSMLS)
Supervisor, Immunohistochemistry
Lions Gate Hospital, North Vancouver, BC