Granted, this is the Treatise. However, I want to inform the students out there that you might want to go for the $1 version instead. The reason is that it is quite hard to cite this version due to its strange number of pages. If, like me, you are writing a paper on the Treatise, you will have to cite it by informing the reader of the book, chapter, section and paragraph. It would be easier to pay one dollar in order to merely cite the page of the Treatise. Other than that (and its tendency to print whole footnotes exactly where you don't want them, in the middle of a paragraph) it's a fine version.