Portrait of Karl Harko von Noorden. The number "1609" appears in the bottom right hand corner of the sheet. Facsimile signature: "Carl von Noorden."
Publisher: Berlin-Charlottenburg: Adolf Eckstein's Verlag.
Photograph of August Krogh, who showed that blood capacity for oxygen is influenced by carbon dioxide tension. Krogh was awarded the Nobel Prize in Physiology and Medicine in 1920.
Portrait of Albert John Ochsner wearing glasses, in three-quarters right profile. Photographed by Adolf Eckstein. Facsimile signature.
Publisher: Berlin-Charlottenburg.