Summary
The historiography of the ‘dark age’ of biochemistry between 1910–1930 is examined. The biochemistry of the period is located within a larger contemporary debate on the interrelationship between structure and function on a submicroscopic level. It is suggested that biocolloid science was an understandable part of the historical development of biochemistry, representing a conceptual bridge between the cell biology of the late nineteenth century, and the era of structural macromolecular studies of proteins that began after 1930.