Fourteen handwritten letters to RHY, plus a press-cutting relating to St John's examination results, with RHY's name underlined, and a handwritten list of herbarium curators, on which Yapp appears 1899-. There is a mix of personal and official correspondence.
Letters written to RHY on botanical matters. Most date from 1911 to 1914; there is one letter from 1926. Also included is the menu and seating plan for the Royal Society's anniversary dinner in 1913. One letter includes a plant sample.
Letters written to and from RHY and LK before and after their engagement and wedding. Correspondents include F.E. Weiss, J.H. Salter, Frank Bather, and members of the Klintberg and Yapp families.
Letters from friends and family congratulating the couple on their marriage. Includes some earlier letters of congratulation on their engagement.
Three letters from RHY to his mother describing the wedding, plus a list of photographs with notes on those that had been ordered.
Love letters LKY to RHY post-wedding
Handwritten letters from Lajla to her husband. Letters are numbered continuously from sequence pre-marriage, 107-186, with some gaps. Empty envelopes are present for numbers 187-189,191-192,194-203, and 207.
Love letters RHY to LKY post-wedding
Letters written from RHY to his wife following their marriage. Letters are numbered in a new sequence, 1-98, with no gaps or envelopes. There are pressed plant specimens enclosed in two letters.
Letters of congratulation to RHY on his appointment to a professorship at Belfast. Some are from family, but the majority are from friends and colleagues.
Family letters to and from RHY and his wife on the subject of the war.
Letters regarding the birth of children
Mostly family letters around the time of Eric's (1914) and Margaret's (1916) birth. Includes some congratulations from friends.