gave the boatman a florin for saving his son's life

-- No, Mr Bloom said the son himself...
Martin Cunningham thwarted his speech rudely.
-- Reuben J. and the son were piking it down the quay next the river on their way to the isle of Man boat and the young chiseller suddenly got loose and over the wall with him into the Liffey.
-- For God's sake! Mr Dedalus exclaimed in fright. Is he dead?
-- Dead! Martin Cunningham cried. Not he! A boatman got a pole and fished him out by the slack of the breeches and he was landed up to the father on the quay. More dead than alive. Half the town was there.
-- Yes, Mr Bloom said. But the funny part is...
-- And Reuben J., Martin Cunningham said, gave the boatman a florin for saving his son's life.
A stifled sigh came from under Mr Power's hand.
-- O, he did, Martin Cunningham affirmed. Like a hero. A silver florin.
-- Isn't it awfully good? Mr Bloom said eagerly.
-- One and eightpence too much, Mr Dedalus said drily. Mr Power's choked laugh burst quietly in the carriage. Nelson's pillar.
-- Eight plums a penny! Eight for a penny!
-- We had better look a little serious, Martin Cunningham said.