The partitioning of the practice of medicine into various specialties has been the response of the profession to the demand for men trained in special fields. The introduction into medical practice of laboratory diagnosis with thousands of tests performed on the secretions and excretions of the human body, the development of microscopic and gross methods of examination of diseased tissues removed from the body during life and after death, the use of complex and costly apparatus, such as the x-rays and devices for transillumination for the examination of living diseased tissues, brought about the development of clinical laboratories. These are associated variously with hospitals and state departments of health and, in many instances, conducted as a form of medical specialization by individual, specially trained, practitioners. The pathologist of an earlier day was primarily a physician who examined diseased tissues after death. The pathologist of today is one skilled in studying
CLINICAL PATHOLOGY AND MODERN MEDICINE. JAMA. 1932;99(17):1430–1431. doi:10.1001/jama.1932.02740690040014
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