Lawrason Brown studied under Osler, in Baltimore, graduating at the turn of the century, and developed his great clinical ability under Trudeau, at Saranac Lake. As a result he combined an abiding fondness for old books and medical history with a thorough training in the art of physical diagnosis at the period of its greatest glory. In his skill in diagnosis he represented perhaps the most perfect flowering of that era. And yet his greatest work was not in the ultra refinement of those methods but in the simplification of the diagnosis of tuberculosis for the practitioner and of the treatment for the patient. At the same time that he was collecting old medical books and prints for his library, he was always in the van of the pioneers in new methods, such as the use of roentgen rays in diagnosing and the use of ultraviolet radiation in combating tuberculosis.