I'm a bookseller and have here for sale a daily readings book (priced GBP 9.50) with a bookplate of John Aitken (motto "In Cruce Salus"), and with lots of dates of births, deaths and marriages.
On July 10 it says "1844 Birthday" so this is presumably his own birth date, especially as his sisters seem to have died around 1910.There are also references to the Warrens of Cleddens, Glasgow.
Here are a few dates: January 7 1886: Uncle Sandy Died January 8 1876: Uncle David Died January 20 1914: Wife Died February 4 1912: John Aitken (tertius) born Kilmarnock February 7 1917: Timothy Warren died at Cleddens March 2 1925: Thomas Thorburn Warren died 1925 March 14 1856: Father died May 31 1848: Wife's birthday July 14 1889: Mark born September 8 1926: Audrey Muriel Aitken November 9 1910 Sister Betsy died in her 77th year
There are many other dates, some relating to the Bain and Baird families.
If interested, please contact me by email, firstname.lastname@example.org