Well, I finally got around to trying one out. They are packed emulsion to emulsion, as goldie suggests, and it turns out to be pretty easy to determine under a safelight which side is the emulsion.
My first "smoke test" shot is attached. It's badly underdeveloped, because I spooked myself into thinking it was getting too dark and I was going to lose the image in base fog---in fact nothing of the kind was happening and I should have left it in for another three or four minutes. I think the exposure was 1 second at f/11.
On the whole, I think this is a much better result than I had any right to expect. Thanks for the assistance! Now I just need to figure out what subjects merit the use of the other 11.