I'm with Don on this one. I have nothing against the fundamentals as they are all in line with Epicurean physics as we know it, but please consider changing introductory sentence:
'The Elementary Principles of Nature below are as set forth by Epicurus and summarized in English by Norman Dewitt in his book “Epicurus And His Philosophy.”'
This statement is misleading. The elementary principles are set forth by Norman Dewitt and are based on Epicurean physics. Dewitt didn't just summarize these - he compiled the list. Until we know otherwise, we can't claim that Epicurus set these twelve fundamentals forth.
Also a technical remark - the links to each of the principles are currently broken.