In the second programme he delves deeper into the mysteries of comedy to discover why the poet Shelley wrote `Our sincerest laughter with some pain is fraught'.
In the third programme, he looks into the practicalities of the comedy business - source material, the vagaries of an audience and life on the road.
In the fourth programme, he tests the theory that laughter can lower blood pressure, reduce stress and cure depression.
In the fifth programme, he tests the adage that `Man is the only animal that laughs', and examines the role of birds and animals in the life of the comedian.
He makes some observations on humorous writing and offers career guidance for the would-be comedian.