When searching for the book be sure to look for the 1905 edition. To my eye, the Harvard copy looks best. It is on Google Books in a PDF version, but it's a bit difficult to find.  In addition to the title and author's name try search terms "1905" and "Harvard".  Here is a result which I found searching "Google Books":

If this link is still open, find the PDF here:


Put the cursor on "EBOOK - FREE" and click on either

"Read the book for FREE", or

"Download PDF".

A few represtntative pages are posted here.

webpages and Eos image copyright 2013  M  Nealon