I want to read the Notebooks, but there are 1,565 pages and I have too much else to read. At a page a day it would take a little over four years, but be manageable. Fortunately Project Gutenberg (who make freely available online out-of-copyright books) has created a text version of the Notebooks of Leonardo Da Vinci. You can download it. It lacks the illustrations of the original, but it's Good Enough. Using this site, I can read one page a day using my RSS News Reader.