Doug Miller responds:

I didn't have room for any when I packed. Anyway, the firewood, cut to
18" lengths and split, appeared to be walnut. I'm sorry to say I burned
some of it, but I brought home a half-dozen chunks. Does anyone have any
ideas on how to cut it safely into boards. I don't have a bandsaw, but I
do have a table saw. I've given some thought to making a sled with a
wooden clamping device, but the idea of the saw grabbing the chunk and
flinging it makes me nervous.

Don't have a bandsaw? Get one -- you have the perfect excuse. :-)
Or find someone who does. That's really the best tool to use for this.

Bandsaw is best, plain ol' 5-1/2 point ripsaw will work, bowsaw probably will
work on that length of wood. Worst choice: tablesaw. Uneven shapes almost
guarantee flying objects. Can't call 'em UFOs, cause you'll know what they are.

Charlie Self
"Inanimate objects are classified scientifically into three major categories -
those that don't work, those that break down and those that get lost." Russell
Baker