When I introduced the first of these six volumes in 1978 I had no great hope that further instalments would be called for, but the dogged, some might say reckless, courage of my publisher has been rewarded with esteem, if not with much ready money.

Introduction.

University Arms Hotel
Cambridge

5 January 1961

My dear Rupert
Now this really is a miserable affair - the cold fact being that we are kept pretty hard at work all day, and after dinner there has been a lot of 'Come and have a glass of port' which always dribbles on till near midnight.