21. Letter from Michael Heidelberger to A. D. Hershey

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22. Letter from Michael Heidelberger to A. D. Hershey

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23. Letter from Michael Heidelberger to Felix Haurowitz

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24. Letter from Simon Flexner, Rockefeller Institute for Medical Research to Michael Heidelberger

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25. Letter from Phoebus A. Levene, Rockefeller Institute for Medical Research to Michael Heidelberger

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26. Goethe as a Scientist

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27. To Stop Bomb Threats [Letter to the Editor of The New York Herald Tribune]

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28. Letter from Simon Flexner to Michael Heidelberger

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29. Letter from Michael Heidelberger to the Loyalty Board, Bronx Veterans' Administration Hospital

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30. Immunochemistry

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31. Letter from Karl Landsteiner to Michael Heidelberger

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32. Wedding March [Sheet music]

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33. Induction of Primary and Inhibition of Secondary Antibody Response to Hapten by Hapten Conjugates of Type III Pneumococcal Polysaccharide

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34. Immunochemical Relationships between Bacteria Belonging to Two Separate Families: Pneumococci and Klebsiella

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35. Quantitative Studies on the Precipitin Reaction: The Role of Multiple Reactive Groups in Antigen-Antibody Union as Illustrated by an Instance of Cross-Precipitation

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36. Letter from Richard Willstatter to Michael Heidelberger

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37. Letter from Richard Willstatter to Michael Heidelberger

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38. A 'Pure' Organic Chemist's Downward Path: Chapter 2--The Years at P. and S

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39. A 'Pure' Organic Chemist's Downward Path

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40. Letter from Michael Heidelberger to his mother, Fannie Camp Heidelberger

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