Download Full Text (7.5 MB)
Article written by Cal R. Fremling detailing step-by-step instructions for a basic classroom laboratory experiment. The article includes photographs of students performing steps of the procedure, discussion of data and possible conclusions, and other possible applications using the materials and procedure. Fremling is credited as: "Winona State College, Winona, Minnesota." Abstract: "A novel experiment in aquatic biology employing polyethylene bags can be utilized by large groups. The author is Professor of Biology at Winona." Article reprinted from The American Biology Teacher, volume 30, number 6, September 1968. Part of the Cal R. Fremling Collection.
Biologist; s Laboratory; Fish; Pollution
Fremling, Cal R., "An experiment in diffusion, water pollution, and bioassay using polyethylene film as a semipermeable membrane" (1968). Cal Fremling Papers. 21.
Requests to reproduce this image must be granted by the Winona County Historical Society.
Winona County History Center-Armory Museum