""Front ""; ""contents""; ""A first speck of light""; ""The first decades of curiosity 1730-1779""; ""The quest for the secret of the sunlight 1779-1780""; ""A life in letters, the story continues 1780-1799""; ""Content, contest and context""; ""A crucial instrument: the rise and fall of the eudiometer""; ""Memory and priority: who was first? and why has he been forgotten?""; ""Science as IngenHousz knew it & science as we know it""; ""A case of complexity: ecological questions for the philosophy & history of science""; ""Photosynthesis, a bright future for the light of the sun""