In contrast to many other scientists, Donaldson captures many world events in his journal. Entries include an on-the-ground account of the 1893 World's Fair (5/13-5/27/1893) and news pertaining to the Great Baltimore Fire (2/7/1904), Russo-Japanese War (2/8/1904), and World War I. Donaldson studiously records the spread of war in Europe (7/31/1914), the increasing likelihood of U.S. involvement (2/4/1917), and false reports of peace. Several days before the Armistice, he writes, "Peace was reported here about 1 pm. The town went wild & remained wild most of the night. Report was a hoax" (11/7/1918). Donaldson also proves an active observer of and participant in U.S. politics. For example, in addition to recording the election of President Wilson (11/5/1912) and death of President Harding (8/2/1923), he writes that he travels to Harrisburg to lobby against an "anti-vivisection bill" (4/25/1907) and attends a "League of Nations dinner" (1/15/1932).
 
Perhaps most surprising is how personal affairs infiltrate the Donaldson diaries. Sometimes such asides are amusing
 
for example, in one entry he writes that he was "attacked by goose without cause" (3/31/1917). Elsewhere, they're more serious and evocative. Shortly after Donaldson writes that his first wife, Julia, is "diagnosed melancholia" and put on an "opium treatment" (9/13/1904), he records her suicide: "our dear Julia was found dead by her own hand at 7 o'clock this morning. She was still warm when found. It is desolation—the saddest of days" (11/10/1904). Several years later, he notes his engagement to Emma Brock (3/1/1907) and, still later, the birth of a son Harry, (3/16/1920). In the 1930s, his health appears to deteriorate: Donaldson begins tracking weight fluctuations on 7/13/1931 and undergoes a metabolism test on 10/17/1934. His last entry, written in third-person in a different hand, appears to have been maintained by someone else, possibly Emma. The diary concludes, "The end at 2 a.m." (1/23/1938).

Contained in 49 volumes, the Herbert Donaldson diaries traverse 1890-1938 and provide glimpses of his neurological work at the University of Chicago and the Wistar Institute in Philadelphia, meetings with leading scientists--including Boas and Davenport--European and American travels, recreational activities, personal affairs, and leadership at the National Academy of the Sciences, the American Neurological Association, the Physiological Society, the Lenape Club, the Rush Society, as well as the American Philosophical Society, where he was elected a member in 1906 and vice president in 1935. The Donaldson diaries may interest researchers exploring the history of mental health, American Philosophical Society membership, twentieth-century U.S. politics, the 1893 World's Fair, and World War I.
 
In contrast to many other scientists, Donaldson captures many world events in his journal. Entries include an on-the-ground account of the 1893 World's Fair (5/13-5/27/1893) and news pertaining to the Great Baltimore Fire (2/7/1904), Russo-Japanese War (2/8/1904), and World War I. Donaldson studiously records the spread of war in Europe (7/31/1914), the increasing likelihood of U.S. involvement (2/4/1917), and false reports of peace. Several days before the Armistice, he writes, "Peace was reported here about 1 pm. The town went wild & remained wild most of the night. Report was a hoax" (11/7/1918). Donaldson also proves an active observer of and participant in U.S. politics. For example, in addition to recording the election of President Wilson (11/5/1912) and death of President Harding (8/2/1923), he writes that he travels to Harrisburg to lobby against an "anti-vivisection bill" (4/25/1907) and attends a "League of Nations dinner" (1/15/1932).
 
Perhaps most surprising is how personal affairs infiltrate the Donaldson diaries. Sometimes such asides are amusing
 
for example, in one entry he writes that he was "attacked by goose without cause" (3/31/1917). Elsewhere, they're more serious and evocative. Shortly after Donaldson writes that his first wife, Julia, is "diagnosed melancholia" and put on an "opium treatment" (9/13/1904), he records her suicide: "our dear Julia was found dead by her own hand at 7 o'clock this morning. She was still warm when found. It is desolation—the saddest of days" (11/10/1904). Several years later, he notes his engagement to Emma Brock (3/1/1907) and, still later, the birth of a son Harry, (3/16/1920). In the 1930s, his health appears to deteriorate: Donaldson begins tracking weight fluctuations on 7/13/1931 and undergoes a metabolism test on 10/17/1934. His last entry, written in third-person in a different hand, appears to have been maintained by someone else, possibly Emma. The diary concludes, "The end at 2 a.m." (1/23/1938).