The man bid up to fifteen hundred, but Brown held out; and I found that instead of putting seven hundred and seventy pounds into his pocket I had taken thirty out of it.

I accordingly offered to return the thirty pieces.

Brown, taking the offer as an insult, declined all further communication with me.

I then insisted on the matter being submitted to arbitration, and demanded fifteen hundred pounds as the full exchange value of the picture.

All the arbitrators agreed that this was monstrous, whereupon I contended that if they denied my right to the value in exchange, they must admit my right to the value in use.