Caption accompanying photograph: Yale University, School of Medicine.

Continuous Extractor
A continuous liquid-liquid extractor in use for the extraction of steroid sex hormones from body fluids. The extracting fluid is benzene which is being continuously dispersed in a watery phase, thereby extracting and concentrating the sex hormones. In one operation the hormones may be concentrated from 2000 to as high as 200,000 times.

Yale University – Endocrinology, c. 1905-1980. Rockefeller Foundation records; Photographs – Series 100-1000; United States – Series 200; Medical Sciences – Subseries 200.A; Rockefeller Archive Center.