Treehugger turned up this gem from 1932:

Lloyd Alter writes:

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Outrigger globe floats fold down to keep it stable, sort of training wheels for water; they “revolve freely like wheels, resulting in a minimum of drag.”

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Propulsion on water is provided by little wedge-like fins on the rear float/ tire. One would think that this is a lot of work, but our French inventor appears to ride in comfort in a suit while smoking a pipe, and demonstrated it in a large swimming pool.

This bike is perfect for dealing with climate change. Sea-level rise, storm surges — no problem when you can just keeping biking straight through the waterlogged streets. But alas, it’s trapped in the temperate past until someone manufactures a new one. Would that this bike were a time bike!