General view of a laboratory assistant, identified as "Mac May," posed at a work bench for mixed acid materials. Notably, the photograph is printed as a postcard, with space reserved on the verso for a message, mailing…

General view of a laboratory bench with assorted glassware and scientific apparatus. Notably, the photograph is printed as a postcard, with space reserved on the verso for a message, mailing address, and postage. While…

General view of an unidentified woman, presumably a laboratory assistant, posed near a work bench with assorted scientific apparatus and glassware visible in the background. Notably, the photograph is printed as a…

General view of an unidentified man, presumably a laboratory assistant, posed near a work bench with assorted scientific apparatus and glassware visible in the background. While the setting of this photograph is also…

General view of an unidentified woman, presumably a laboratory assistant, posed near a work bench with assorted scientific apparatus and glassware visible in the background. While the setting of this photograph is also…

General view of an unidentified woman, presumably a laboratory assistant, posed near a work bench with assorted scientific apparatus and glassware visible in the background. While the setting of this photograph is also…

General view of an unidentified woman, presumably a laboratory assistant, posed near a work bench with assorted scientific apparatus and glassware visible in the background. While the setting of this photograph is also…

General view of an unidentified man, presumably a laboratory assistant, seated at a work bench with assorted scientific equipment and glassware. While the setting of this photograph is also unidentified, the photo was…

General view of a laboratory bench at the Hospital of the Rockefeller Institute for Medical Research (H.R.I.M.R.) showing assorted laboratory glassware and scientific apparatus. The Rockefeller Institute for Medical…

General view of a laboratory bench at the Hospital of the Rockefeller Institute for Medical Research (H.R.I.M.R.) showing assorted laboratory glassware and scientific apparatus. The Rockefeller Institute for Medical…

General view of a laboratory bench at the Hospital of the Rockefeller Institute for Medical Research (H.R.I.M.R.) showing assorted laboratory glassware and scientific apparatus. The Rockefeller Institute for Medical…

Distillation is a method of separating chemical substances based on differences in their volatilities in a boiling liquid mixture. A distilled beverage is a liquid meant for consumption containing ethyl alcohol…

General view of two unidentified individuals seated at a laboratory bench in the so-called "chemistry room" at Park College (later Park University) located in Parkville, Missouri. Assorted laboratory glassware,…

General view of chemist Ernest Arnold Congdon (right) in the chemistry laboratory at the Drexel Institute of Art, Science, and Industry (later Drexel University) in Philadelphia. Several laboratory stations with…

Elevated view of a laboratory, presumably the chemistry laboratory at the Drexel Institute of Art, Science, and Industry (later Drexel University), showing several rows of shelves containing assorted ingredients and raw…

Hand-colored engraving by J. Pass after the drawing by Henry Lascelles for the section on "Chemistry." From Volume 4 of the Encyclopaedia Londinensis; or, Universal Dictionary of Arts, Sciences, and Literature,…

Hand-colored engraving by J. Pass after the drawing by Henry Lascelles for the section on "Chemistry." From Volume 4 of the Encyclopaedia Londinensis; or, Universal Dictionary of Arts, Sciences, and Literature,…

Hand-colored engraving by J. Pass after the drawing by Henry Lascelles for the section on "Chemistry." From Volume 4 of the Encyclopaedia Londinensis; or, Universal Dictionary of Arts, Sciences, and Literature,…

Hand-colored engraving by J. Pass after the drawing by Henry Lascelles for the section on "Chemistry." From Volume 4 of the Encyclopaedia Londinensis; or, Universal Dictionary of Arts, Sciences, and Literature,…

Hand-colored engraving by J. Pass after the drawing by Henry Lascelles for the section on "Chemistry." From Volume 4 of the Encyclopaedia Londinensis; or, Universal Dictionary of Arts, Sciences, and Literature,…

Hand-colored engraving by J. Pass after the drawing by Henry Lascelles for the section on "Chemistry." From Volume 4 of the Encyclopaedia Londinensis; or, Universal Dictionary of Arts, Sciences, and Literature,…

Hand-colored engraving by J. Pass after the drawing by Henry Lascelles for the section on "Chemistry." From Volume 4 of the Encyclopaedia Londinensis; or, Universal Dictionary of Arts, Sciences, and Literature,…

Hand-colored engraving by J. Pass after the drawing by Henry Lascelles for the section on "Chemistry." From Volume 4 of the Encyclopaedia Londinensis; or, Universal Dictionary of Arts, Sciences, and Literature,…