Black-and-white etched portrait of naturalist and physician Marcus Elieser Bloch. Engraving by Johann Conrad Krüger. From the Oekonomische Encyklopädie, oder allgemeines System der Staats- Stadt- Haus- und Landwirthschaft -Wirthschaft, in alphabetischer Ordnung, Volume 31, by Johann Georg Krünitz, published Berlin: J. Pauli.
Black-and-white stipple engraved portrait of naturalist and physician Marcus Elieser Bloch. From Dictionaire des sciences médicales, Volume 2, by Antoine Jacques Louis Jourdan, published Paris: C. L. F. Panckoucke.
Color postcard with a reproduction of a painting by Michael Califano entitled The Ignominy of the Twentieth Century. The painting depicts Albert Einstein facing Adolf Hitler, who stands in front of a bloody sword. An inscription on the back reads: "Neither hatred nor persecution can stay the progress of science and civilization."
Postcard with a caricature by David Levine of Sigmund Freud. Originally appeared with the article Was Freud a Crypto-Biologist? by Richard Wollheim, published in the November 8, 1979, edition of The New York Review of Books.