Smithsonian Astrophysical Observatory Radiation and Organisms Division Search this
Smithsonian Institution Building (Washington, D.C.) Search this
Century of Progress International Exposition (1933-1934 : Chicago, Ill.) Search this
4 x 3.25;
Between 1929 and 1934
See also MNH-11036B.
Laboratory of the Division of Radiation and Organisms, located in the basement of the Smithsonian Institution Building, or Castle. Shown here is a plant growth tube with control equipment for experiments on wheat growth.