After various searches and deciphering of the last page in this old book I got at a garage sale years ago, I discovered that it is in fact of Freemason origin.

What you see here is the last page, which contains something called the Test Oath, which is to be recited by a Master or some or other.

A passage in a book by Edmond Ronayne provided me with the complete translation of this page as follows... (with slight but negligible errors)

I ....... of my own free will and accord in the presence of almighty god and these witnesses, do hereby and hereon most solemnly swear that I have been regularly initiated as an Entered Apprentice, passed to the degree of Fellow Craft, and raised to the sublime degree of Master Mason, in a regularly constituted Lodge of Masons. And that I am not now under the sentence of suspension or expulsion, and know of no reason why I should not hold Masonic fellowship with my brethren, so help me God.

Now, to figure out the next step...