An odd old saying

There is an old tripartite saying that sticks in my mind -- mainly because I don't understand the second part, I think. It was said to be fatherly advice given by a British aristocrat to his son:

1. Never drink port after champagne.

2. Never hunt south of the Thames

3. Never give your lady one in the morning. You never know what might come up during the day.

I would be interested if anybody knows other versions of that advice and if anybody knows who first uttered it. I remember reading it long ago in a book but have quite forgotten which one.

Posted by John Ray (M.A.; Ph.D.).