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women of science
M. Sumwalt
Sumwalt letter
Sumwalt's letters to Dr. Merkel H. Jacobs. Letter of July 12, 1935 from Baltimore "Colony" refers to Woods Hole
Sumwalt letter
Sumwalt letter
Letter of September 7, 1935 from Ann Arbor, Michigan.
Margaret Sumwalt McCouch

Margaret Sumwalt earned her Ph.D. in Physiology at the University of Pennsylvania in 1929 and continued in a full career of teaching and research.

Her association with the MBL began in 1923, when she was listed as a student in the Botany course. In 1926, she was listed as a graduate student from the University of Pennsylvania, at the MBL as a Beginning Investigator in Physiology. In 1927, now an Instructor from the University of Pennsylvania, she was again listed at the MBL as a Beginning Investigator. From 1931 to 1933, she was a summer Instructor at the MBL and was also a Member of the Corporation.

Although Sumwalt's record indicates an active and productive scientific career, that career was nearly thwarted at the outset by her lack of financial resources. Through the intervention of Merkel H. Jacobs, funds were obtained for her continued study. Jacobs, the MBL's Director from 1926 to 1937, was also Professor of Physiology at the University of Pennsylvania and procured for Sumwalt a paying position as laboratory assistant, along with free tuition at that institution. When the Dean of the Medical School balked at the offer of free tuition, Jacobs came to Sumwalt's defense.

Sumwalt held the rank of Assistant Professor at the Women's Medical College of Pennsylvania and was also Assistant Professor of Pharmacology at the University of Michigan. She was a Fellow in the National Institutes of Health and was a member of the U. S. Public Health Service. Her areas of research were in trematode morphology, electrophysiology, permeability and water balance, and pharmacology of morphine derivatives.

Partial Bibliography

Sumwalt, Margaret. Permeability of the Fundulus egg to ions: chorion versus skin. Proceedings of the Society of Experimental Biological Medicine, Vol. 25, 1928.

Sumwalt, Margaret. Potential differences across the chorion of the Fundulus egg. Biological Bulletin, Vol. 56, 1929.

Sumwalt, Margaret. Ion effects upon ion permeability of the Fundulus chorion. Biological Bulletin, Vol.
64, 1933.

Sumwalt, Margaret, William Ruthrauff Amberson, and Eva Marianne Michaelis. Factors concerned in the origin of concentration potentials across the skin of the frog, Journal of Cell & Comparative Phusiology, Vol. 4, No. 1, 1933.

Sumwalt, Margaret and John C. Bridges. The effect of acidity upon the potassium poisoning of Fundulus eggs. Journal of Cell & Comparative Physiology, Vol. 5, 1934.

Sumwalt, Margaret, W. H. Erb, and H. C. Bazett. The water and chloride excretion of decerebrate cats. American Journal of Physiology, Vol. 112, 1935.

Sumwalt, Margaret and Hugo Krueger. The effect of various distending pressures on the activity of the dog's ileum. American Journal of Physiology, Vol. 116, 1936.

Sumwalt, Margaret and Hugo Krueger. The effect of morphine on the activity of the dog's ileum at various distending pressures. Journal of Pharmacological and Experimental Therapy, Vol. 57, 1936.

Sumwalt, Margaret, and Eugene M. Landis. An automatic recording apparatus for measurement of colloid osmotic pressure. Journal of Laboratory and Clinical Medicine, Vol. 22, 1937.