The substantial life story of a relatively unknown woman--one of the first to attend the University of Michigan medical school; with her sister Edith (the classics scholar) a student at a German University (when they did not grant degrees to women); a valuable worker at Hull House with Jane Addams; and for many years the only, for more years the leading authority on occupational diseases in the U.S. Her definitive studies of poisoning from lead, carbon monoxide, carbon disulphide and other industrial chemicals led manufacturers to institute safeguards for the benefit of their employees. A conscientious objector who worked with jane Addams to encourage ""continuous mediation"" during World War I, she was one of the few to predict the effects the Treaty of Versailles would have on the European economy. The first woman on any Harvard faculty, she was also an energetic crusader for justice, spoke out for Sacco and Vanzetti and, in spite of accusations of being pro-German, solicited for funds to help German children orphaned by the war. Recipient of numerous awards and honorary degrees, she continued to speak after eighty, to write after ninety; at ninety-eight she lives in Hadlyme, Mass. This story of dedication and vision could write itself; here it is treated, appropriately, with admiration and respect, and with an energy becoming its subject.