I'll look into Distributed Proofreaders. Thanks for the tip.
I've done spelling modification as I've gone along to eliminate the many archaic spellings. Here's an example of the comma issue:
...I should close the book with a full persuasion, that the same vein of good sense, which showed itself in the former and much greater part of it, ran through the other also: especially having arguments à priori, which obliged me to believe, that the author of it all was the same person.
I've seen this sort of thing before in 18th c. texts. I'm not sure what the rule was, exactly, but it's shown here in the commas "persuasion, that" and "believe, that". We no longer use commas in this way, and it's distracting to read now. I think it's probably worthwhile to purge those commas in the same spirit as the spelling modernization.
I'm also taking the liberty of expanding the obscure abbreviations he uses in his footnotes and trying to locate the sources of the quotes he uses there so I can indicate them more precisely. Many editions of the book already include translations of the footnotes by John Clarke (also long out of copyright).
So for instance, this cryptic footnote from the original:
Ubi virtus, si nihil situm est in ipsis nobis? Cic. הוא עמוד התורה והמצוה רשות לכל אדם נתונה אם רצה להטות עצמו לדרך טובה Maim. הרשות היא הבחירה Nahh. Ab.
With Clarke's help became:
Ubi virtus, si nihil situm est in ipsis nobis? “Where is virtue
then, if there be nothing within our own power?” Cic.
הוא עמוד התורה והמצוה רשות לכל אדם נתונה אם רצה להטות עצמו לדרך טובה
“There is a power given to every man, if he be but willing to incline
himself to the way that is good--This is the support of the law and the
commandments.” Maim.
הרשות היא הבחירה “This power is what we call free will” Nahh. Ab.
And after my tenacious Googling, becomes the yet more legible:
Ubi virtus, si nihil situm est in ipsis nobis? “Where is virtue then, if there be nothing within our own power?” (Cicero, Academica). הוא עמוד התורה והמצוה …רשות לכל אדם נתונה אם רצה להטות עצמו לדרך טובה “There is a power given to every man, if he be but willing to incline himself to the way that is good… This is the support of the law and the commandments.” (Maimonides, Mishneh Torah, Hilkot Teshubah, V, 1, 3). הרשות היא הבחירה “This power is what we call free will” (Isaac Abravanel, Nahalot Abot).