In 1923, a young researcher from California discovered a substance essential for life—vitamin E. However, instead of continuing a brilliant scientific career, Katharine Bishop had to choose between family and the laboratory.
From Anatomy to the Mystery of Reproduction
Katharine Scott was born on June 23, 1889 in New York. Her path to science led her through the top American universities—Wellesley College, medical courses at Radcliffe, and a medical degree from the prestigious Johns Hopkins University in 1915. At a time when women were only a small fraction of the medical field, Bishop not only graduated but immediately began research work.
After moving to Berkeley, she took up a position as a lecturer in histology at the University of California. It was there that she began collaborating with Herbert McLean Evans, an endocrinologist with an already established reputation. Together, they studied connective tissue cells, publishing a monograph on the subject. However, their most groundbreaking experiments were yet to come.
Rats, Lard, and the Unknown Factor X
The starting point for their research was the reproductive cycle of rats. Bishop and Evans developed a standard diet that allowed the animals to reproduce normally. Then, they systematically eliminated specific ingredients, observing the effects of their absence. When lard became the only fat source in their diet, the rats appeared healthy but their ability to reproduce disappeared completely.
Females could not carry pregnancies to term because their placentas were breaking down. In males, the cells that produce sperm in the testes degenerated, leading to total infertility. For Bishop and Evans, it was clear that the diet was missing a crucial component. They initially named it factor X.
Further experiments determined that the mysterious factor was found in lipid extracts from lettuce and wheat germ. A few years earlier, vitamin D had been discovered, so the new substance received the next letter in the alphabet and entered history as vitamin E.
The Price of Motherhood
A year after their breakthrough discovery, in 1924, Bishop left the university laboratory. However, this did not mark the formal end of her scientific career. For the next five years, she worked as a histopathologist at the George Williams Hooper Foundation for Medical Research in San Francisco, analyzing diseased tissues.
The real turning point came after her marriage and the birth of two daughters. Bishop returned to school for two years, this time studying public health. But returning to basic research was no longer an option. By the mid-1930s, she had become a practicing physician and anesthesiologist at St. Luke’s Hospital in San Francisco.
From 1940 until her retirement in 1953, she worked at Alta Bates Hospital in Berkeley. She died in her home in the same city on September 20, 1975, at the age of eighty-six.
In the Shadow of History
The life of Katharine Bishop illustrates a broader problem faced by women in science in the first half of the 20th century. Despite having equal qualifications and contributions to research, it was her collaborator Herbert Evans who went on to build an academic career and received most of the accolades for the discovery of vitamin E. Although Bishop is mentioned as a co-discoverer, she faded from the view of the scientific community.
Her case was not unique. Dozens of talented female researchers had to choose between family and the laboratory, while their male colleagues could combine both without social stigma. Vitamin E, a substance essential for proper reproduction, was discovered by a woman who herself had to sacrifice scientific fertility for biological motherhood. History is full of such bitter ironies.
Rory Thornfield
Rory's grandfather left behind a wartime diary filled with accounts of a minor Burma skirmish that history books never mentioned. Reading it, Rory realized: behind every famous battle are dozens of forgotten struggles, each with its own human drama.
His preferred topics: The overlooked corners of military history – secondary campaigns, shadow battalions, local conflicts that never made headlines. From medieval sieges to twentieth-century expeditions, he focuses on the soldiers, not the generals. The people who faced impossible choices and carried those experiences forever.
Rory strips away the romanticism without losing respect for those who served. He combines tactical analysis with personal stories, examining human endurance and moral complexity rather than celebrating warfare. His writing is balanced, thoughtful, and deeply researched.
Outside work, Rory visits forgotten battlefields (now quiet farmland), photographs war memorials nobody tends anymore, and interviews veterans' families.