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    • Immunization of Newborn Babies Against Tuberculosis Registered in France, 1924-1935
    • circa 1935

    Postcard depicts bar graph documenting the increase in the number of tuberculosis vaccinations administered to newborn babies.

    • Pasteur Institute - Classroom
    • circa 1920

    Postcard depicts three men and one woman working in a laboratory at the Pasteur Institute.

    • Pasteur Monument
    • circa 1920

    Postcard depicts a statue of Louis Pasteur in Paris, France.

    • Pasteur Institute - Library
    • circa 1920

    Postcard depicts three men working in the library of the Pasteur Institute.

    • 1887-Jun-20

    The community of Éply in France raised 20 francs "to found an establishment for the treatment of hydrophobia." In this context, hydrophobia is an irrational fear of water brought on as a symptom of rabies. Receipt…

    • Part of Le Soleil [The Sun]
    • 1870

    Fig. 1: Spectrum of "red to orange" stars, particularly Alpha Orion and Antares. Secchi included Alpha Herculis, Beta Pegasi, Alpha Orion, and Antares in this third of four classes of stars.

    Fig. 2: Spectrum of…

    • Part of Le Soleil [The Sun]
    • 1870

    Fig. 1: Spectrum of "yellow" stars. Secchi included the sun, Pollux, Arcturus, Aldebaran, and Procyon in this second of four classes of stars.

    Fig. 2: Spectrum of "white" stars. Secchi included Sirius, Vega, Altair,…

    • Part of Le Soleil [The Sun]
    • 1870

    Fig. 1: Janssen (Pierre Jules César Janssen)
    Fig. 2: Brewster (David Brewster)
    Fig. 3: V. der Willingen (Volkert Simon Maarten van der Willigen)

    Secchi used these three solar spectra to illustrate how the position of…

    • Chromatic scale of tones: grey
    • 1864

    The gamut of grey tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: orange-yellow
    • 1864

    The gamut of orange-yellow tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: orange
    • 1864

    The gamut of orange tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: red-orange
    • 1864

    The gamut of red-orange tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: red
    • 1864

    The gamut of red tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: yellow
    • 1864

    The gamut of yellow tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: green-blue
    • 1864

    The gamut of green-blue tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: yellow-green
    • 1864

    The gamut of yellow-green tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: green
    • 1864

    The gamut of green tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: blue
    • 1864

    The gamut of blue tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: blue-purple
    • 1864

    The gamut of blue-purple tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: purple
    • 1864

    The gamut of purple tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Chromatic scale of tones: purple-red
    • 1864

    The gamut of purple-red tones from light to dark along a 20-tone scale, where positions 0 and 21 correspond to white and black respectively.

    • Circular zone of continuous colors
    • 1864

    Inscribed: "Zône circulaire dont les couleurs sont continues. On la suppose formée d’une reunion de zônes excessivement étroites et contigues parmi lesquelles il en est trois qui sont a des distances égales, RR, JJ, et…