Ooooh, boy! Am I embarrassed!

I gave what was intended to the the sage advice of Strunk & White in The Elements of Style, but I messed it up, BUT GOOD!
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Correcting it:
"1. To form the plural possessive of a singular noun, add apostrophe and S, regardless of the final letter. Thus, 'the witch's curse'" (and a few more examples). "Exceptions are such ancient names as 'Jesus' teachings' and 'Moses' laws.'"   

Even with the ancient names, S&W looked with favor on recasting the sentence to refer to "the teachings of Jesus" and "the laws of Moses".
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Mea culpa, mea culpa, mea maxima culpa!

Dave Oesterreich