Alexander Kégl from his early youth preferred taking notes from his readings on the thoughts dear or important to him. The first notebook surviving in his bequest still contains the writings of an adolescent, illustrated with several drawings. The notes soon become multilingual and they maintain this characteristic until the death of their author. In the later notebooks we can distinguish not only the handwriting of Alexander but also that of his sister Teréz. On certain topics their notes almost alternate, as if they wanted to share with each other their literary experiences in this way.

The bequest contains the following notebooks:

1. 1872 – 1 July 1877, 1885
2. 3 October 1882 – 1 August 1883
3. 30 November 1883 – 5 March 1885
4. 22 March 1885 – 19 March 1887
5. 22 March 1890 – March 1892
6. 5 February 1891 – 27 January 1892
7. 18 July 1893 – 31 December 1894
8. 1 March 1897 – 25 April 1899
9. 6 May 1899 – 1 November 1900
10. 16 November 1900 – 9 May 1901
11. 1900 - 1902
12. 10 May 1902 – 29 November 1903
13. 29 November 1903 – 1 January 1908
14. 28 May 1908 – 9 March 1909
15. 7 December 1909 – 26 October 1910
16. 7 December 1910 – 11 March 1912
17. 27 December 1912 – 30 May 1913
18. 1914
19. 1 January 1914 – 15 April 1917
20. 21 January 1918 –
21. 10 March 1918 –