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This article described in detail the physical and chemical similarities between the antigenic polysaccharides in type I, type II, and type III pneumococcus. These experiments were part of Heidelberger's attempts to better understand how each type's unique polysaccharide capsule related to its virulence.
Periodical. Heidelberger, Michael, and Forrest E. Kendall. "Some Physicochemical Properties of Specific Polysaccharides." Journal of Biological Chemistry 95, 1 (1 February 1932): 127-142. Article. 16 Images.. Journal of Biological Chemistry