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1 Lilly Research Laboratories, Eli Lilly and Company, Indianapolis 6, Indiana
By monthly assay of ouabain, from January through December for one year, it has been demonstrated that the frog shows a definite seasonal variation, being less susceptible during the months of July, August, September, and October. Similar assays have been carried out in cats, also throughout a twelve-month cycle, and no seasonal variations have been detected.
Submitted on July 31, 1952