Comparison of an eight-hour plant and a ten-hour plant / Report by Josephine Goldmark and Mary D. Hopkins, on an investigation by Philip Sargant Florence, and associates under the general direction of Frederic S. Lee. Prepared by direction of the Surgeon General.

Galleries and Reading Room

Library

Shop

Café

Our exhibition ‘1880 THAT: Christine Sun Kim and Thomas Mader’ in Gallery 2 is closed this afternoon (Tuesday 17 February) due to essential maintenance work. Thank you for your understanding.

We're running paid user research studies to improve Wellcome Collection online

Hopkins, Mary D. (Mary Della)

Works from the collections

Comparison of an eight-hour plant and a ten-hour plant / Report by Josephine Goldmark and Mary D. Hopkins, on an investigation by Philip Sargant Florence, and associates under the general direction of Frederic S. Lee. Prepared by direction of the Surgeon General.