There is a much better PDF at Project Gutenberg .
The Gutenberg PDF is only 1.9 MB, compared to 12 MB for the scanned image PDF.
The Gutenberg page for this book  also has a link to the LaTeX source for the PDF.
As much as this probably makes me sound like an audiophile, I actually prefer the raw scans over what may essentially be a reprint. They show all the blemishes, unofficial additions, and other marks that make the book look more "real" and give it character.
In this instance, the raw scan has a picture of the cover, as well as an interesting note handwritten near the beginning: "Property of Edward M Sumner" with an address. IMHO these sorts of historical artifacts are worth preserving too. I've come across scans with random notes, bookmark fragments, and newspaper clippings included, and it's always fun to ponder how they got there. (Who is this person and how did he get the book? Is he the one who scanned it? Etc.)
The problem with used books tho is that sometimes I find hair. Ugh.
The PDF is 1892715 bytes = 1.892715 MB. I rounded to two significant digits, giving 1.9 MB.
When Gutenberg says 1.8 MB they probably actually mean 1.8 MiB. 1892715 bytes = 1.80503368377685546875 MiB, or 1.8 MiB to two significant digits.
(I included the link in case anyone was interested in the quality and to prove I didn't just make up the number!)
Weirdly, I can telnet to port 80 & GET / on the ipv6 address just fine.
LaTeX is not an aesthetic cure-all. The original, at least, has been subjected to the critical eye of a typesetter. There is no disputing taste, but I will anyway. If you're using an e-paper device, btw, you can vectorize the text in scanned pdfs like this by applying "Clearscan" in Acrobat, or the equivalent (after which, it becomes readable).
For quick reference, a.co and amzn.com are official shorteners and considered safe. amzn.to links however are third-party and often used to conceal affiliate links.
Just click the book, then under "Share" click the email button, and you'll see..........