This series is arranged alphabetically by record type and includes appointment books, diaries, financial records, legal papers, memorabilia, memorials, photographs, and scrapbooks. Diaries comprise the largest and most substantive portion of the series. Havemeyer's travel diaries (1901-1903) provide brief descriptions of accommodations and travel conditions in Eastern and Western European countries, as well as accounts of sites visited and observations on local customs and people. While attending the Hill School, Havemeyer began keeping "Line a Day" diaries, a practice he continued throughout his life. The most detailed entries coincide with his years as a student at the Hill School and his undergraduate and graduate years at Yale. Some entries provide insight into personal and professional relationships; the majority of entries furnish synopses of daily activities. After 1903, Havemeyer recorded travel notes in the "Line a Day" diaries rather than in separate travel diaries. In later years the diary entries become heavily routine and minimal and, especially in later years, increasingly illegible. Havemeyer relied on the "Line a Day" diaries for his books on Yale history and traditions and his autobiographical works. Included in this series is the diary of Mrs. Henry House of Hartford, Connecticut (1900). The Houses socialized with the Havemeyer family and occasional mention is made of Loomis Havemeyer and Julia Ida Loomis Havemeyer. The majority of entries are recapitulations of the House family's daily activities with minimal allusions to Hartford's social scene. According to Havemeyer's inscription in the diary, he had no knowledge as to how it came into his possession.