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  1. Used for counting blood cells, this particular hemocytometer was manufactured in Italy. Black case that opens by pressing in bronze button to reveal bright blue satin interior lining. Inside, the bottom half of the case…

  2. Used for counting blood cells, this hemocytometer was manufactured in Germany.

    Case opens to reveal thick glass microscope slide with a rectangular indentation that creates a chamber. This chamber is engraved with a…

  3. Glass tube with a collecting reservoir that opens into a funnel (or breast piece). Round red rubber bulb attached to one end of the glass. Stamp in black ink on red bulb reads "Ingram's/'Omega'/London."

  4. Glass tube with a collecting reservoir that opens into a funnel (or breast piece). Round black rubber pump attached to one end of the glass.

  5. Long stem, round bottom flask with custom flange. Needle-size hole on opposite side of flange allows for release of pressure.

  6. 172 items

    The Center for Oral History at the Science History Institute develops and curates a growing collection of comprehensive, professionally conducted oral history interviews. The Center for Oral History aims to create a…

  7. 8 items

    This collection consists of correspondence, reports, and research materials produced and collected by chemist Walter O. Snelling (1880-1965) over the course of his career as an industrial chemist primarily working with…

  8. 135 items

    This collection consists of the business records and printed and photographic materials of BetzDearborn, Incorporated, an American chemical company that manufactured water treatment chemicals for commercial and…

    • The Dropsical Woman

    This engraving, by the French printmaker Jean Baptiste Fosseyeux, reproduces an original painting by Gerrit Dou. The work, titled "The Dropsical Woman," shows a young but finely-robed doctor examining the urine of a…

  9. Tanglefoot brand pesticide can with black and white text on orange label with electronic sprayer graphic. Metal screw cap.

  10. Bee brand pesticide can with black and white text on yellow, blue, and red label with dog, cat, and bottle graphic.

  11. Frostee brand pesticide vaporizer with red and beige text on round tin. Two red lids with green midsection punched with holes.

  12. Mabex brand pesticide vaporizer with white text and moth graphics on red, round tin. Center punched with holes on both sides of tin.

  13. Black Flag brand round metal sprayer with black text on yellow label. Small rubber cap.

  14. Cenol brand pesticide can with navy text on white and bright orange label. Large moth graphic. Metal screw cap.

  15. Cenol brand pesticide can with black and white text on orange and black label. Metal double screw cap.

  16. Ortho brand pesticide bottle with black and white text on red label with fruit graphics. Red screw cap.

  17. Black Flag brand pesticide bottle with black text on light green and white label with flag graphic. White screw cap with sprayer.

  18. Miller's brand pesticide can with black and yellow text on red, yellow, and green label. Butterfly and landscape graphics.

  19. Pesticide can with black and white text on red, white, and green label. "De-Pester" in white text across top of can.

  20. Lee's brand pesticide can with blue, white, and red text on yellow and blue label. Rooster graphic.

  21. 104 items

    This collection consists of print photographs and slides depicting the staff, facilities, and instrumentation of the Perkin-Elmer Corporation, with the bulk of the photographs dating from the 1960's and 1970's.…

  22. Expello brand pesticide vaporizer with black and green text on green label. Black screw cap on bottom, wire handle on top. Meter and red measuring tab with holes along bottom of vaporizer.