5. Spinoza's endnotes are shown thus [a]. The letter is taken from Curley, see Note 3.
6. Search strings are enclosed in square brackets; include brackets.
7. HTML versions of "On the Improvement of the Understanding" are published in the Books On-Line Web Pages;
ttp://www.cs.cmu.edu/books.html and they include:
http://www.physics.wisc.edu/~shalizi/Spinoza/TIE/
http://www.erols.com/jyselman/teielwes.htm