The first journal, "Diary of a Trip to England & Scotland in the Summer of 1912" documents a three-month trip (6/22-9/23) that Amelia and Philip Calvert took while attending the Second International Congress of Entomology. Given the numerous references to "P," it appears that Amelia maintained most if not all of this volume. The journal is remarkable for its variety of modes of transportation: the narrative begins with the transatlantic voyage from Philadelphia to Liverpool aboard a steamer (the S.S. Merion), and includes transport by sailboat, rail, carriage, auto, and funicular. Calvert also furnishes numerous descriptions of European towns and cities, architecture, people, dress, history, weather, and sightseeing of religious and cultural institutions. Notably, the journal includes occasional illustrations and ephemera such as advertisements, receipts, bills, and even a peacock feather (280).
 
The second journal, "Diary of Trip to Europe 1929" follows much the same structure. Once again, it provides an account of a several months travel (7/12-10/2) associated with work, this time a visit to the Zoologists Institute at Freiburg. The couple travels from New York to Antwerp by steamer (the S.S. Lapland). Alongside notes concerning sightseeing—and illustrations and ephemera—Calvert furnishes some comparative observations that might interest twentieth century historians. For example, she writes, "While there are many automobiles and trucks on the streets of Brussels, there is not yet the density of traffic to be seen in Philadelphia" (7/23/1929).

Amelia Smith Calvert maintained two journals of European trips taken in the summer of 1912 and 1929. Although both trips appear to coincide with scientific conferences, Calvert dedicates most of her entries to enthusiastic observations of sightseeing in the United Kingdom, Holland, Belgium, Germany, and Italy. These volumes may interest researchers exploring early-twentieth-century science and European travel.
 
The first journal, "Diary of a Trip to England & Scotland in the Summer of 1912" documents a three-month trip (6/22-9/23) that Amelia and Philip Calvert took while attending the Second International Congress of Entomology. Given the numerous references to "P," it appears that Amelia maintained most if not all of this volume. The journal is remarkable for its variety of modes of transportation: the narrative begins with the transatlantic voyage from Philadelphia to Liverpool aboard a steamer (the S.S. Merion), and includes transport by sailboat, rail, carriage, auto, and funicular. Calvert also furnishes numerous descriptions of European towns and cities, architecture, people, dress, history, weather, and sightseeing of religious and cultural institutions. Notably, the journal includes occasional illustrations and ephemera such as advertisements, receipts, bills, and even a peacock feather (280).
 
The second journal, "Diary of Trip to Europe 1929" follows much the same structure. Once again, it provides an account of a several months travel (7/12-10/2) associated with work, this time a visit to the Zoologists Institute at Freiburg. The couple travels from New York to Antwerp by steamer (the S.S. Lapland). Alongside notes concerning sightseeing—and illustrations and ephemera—Calvert furnishes some comparative observations that might interest twentieth century historians. For example, she writes, "While there are many automobiles and trucks on the streets of Brussels, there is not yet the density of traffic to be seen in Philadelphia" (7/23/1929).

The John Slater Papers include abstracts from his diaries, available as loose, mostly typed pages, which traverse his consequential career in physics (1900-1975). These abstracts trace Slater's doctoral study at Harvard (1923) and postgraduate work at Cambridge University, appointment at MIT (1930), work at the Laboratory for Nuclear Science during World War II, and late-career at the University of Florida (after his retirement from MIT in 1966). His diaries contain notes about a trip to Japan (including Hiroshima and Nagasaki) in the fall 1953, meetings with defense contractors (such as Lockheed Martin) throughout the 1950s and 1960s, a sighting of Sputnik (7/20/1958), notes about an "NSF proposal for computing center" (4/30/1965), associations with and publications of APS members (7/7/1951, 7/7/1972), and Slater's own personal affairs, as excerpted in Selected Quotations. As such, these abstracts may interest scholars researching John Clark Slater's career in the field of physics, biochemistry, atomic history, and the history of science more broadly, as well as those considering World War II and military contractors in the Cold War period, the space race, the history of computing, and the institutional history of the American Philosophical Society.; To supplement these diary abstracts, researchers might choose to expand their exploration of the Slater Papers, which also contain 133 research notebooks (1944-1976), a lengthy series of folders, containing lectures, scientific notes, drafts of manuscripts and papers, correspondence from his collaboration with the Los Alamos Labs (1966-1970), and correspondence relating to the National Academy of Science.