It's available at Project Gutenberg, so yes, it's in the public domain. I hope someone capable of doing a good job of formatting to epub can upload one for you, unfortunately, it's beyond me.
Just realised I found it on the Canadian PG, not sure where you are or if the rules are the same in your country. The link, for anyone who can convert it, is:
http://www.gutenberg.ca/ebooks/strac...ssex-00-h.html