[crystalk]

"A large man" would lean and help himself and a canoe to balance, jump out and help push or bail in emergencies, and is not nearly as dense as the rock. I would hate to think how a 220-lb rock would be borne up if it hit the bottom of a canoe made of bark.

Still, maybe you might be right, if the stone-cookers of Manitoba had had aluminum canoes...

[DensaMensa]

>"A large man" would lean and help himself and a canoe to balance, jump out and help push or bail in emergencies,

I see your point, but I've been in canoes where the load of tents and supplies was more than 220lbs, and even though it didn't help balance or jump out and help push it made the trip OK. ha. I would classify the argument that it couldn't have been moved by a canoe (or otherwise) a pretty weak one.