From the text:
We had a good deal of trouble with steam launches that morning. It was just before the Henley week, and they were going up in large numbers; some by themselves, some towing houseboats. I do hate steam launches: I suppose every rowing man does. I never see a steam launch but I feel I should like to lure it to a lonely part of the river, and there, in the silence and the solitude, strangle it.
Three Men in a Boat (To Say Nothing of the Dog)