We're at ten chicks hatched, and that's probably all that will hatch, I think: the last one started to zip last night, then quit. This evening he started peeping very loudly, but wasn't turning in the egg; I threw common sense aside and helped him out of his egg. Another rough navel but otherwise I can't see why he couldn't hatch. Unless he's another one with funky legs, like the "penguin" from my first hatch. I can't tell yet; he's too new and clumsy.
I plan to eggtopsy the failed eggs in a few days. I pulled one out today and checked it, and found that it had quit while in the process of drawing in its yolk. Sad. Odds are the other nine "too quiet" eggs are the same way. I wish I knew whether this was due to the temperature variations that I've been griping about, or something else. <sigh>