Even Jamie had done that many times.

But Doctor Joe was called upon to solve the problem of cooking potatoes without cooking utensils, and he did it so satisfactorily that the lads practised it every day afterward for a week.
He resorted to a simple and ordinary method.

He dug a narrow trench about six inches deep.

Upon this he built a fire, which he permitted to burn until there was a good accumulation of ashes.

Then he pushed the fire back and raked the ashes out of the trench.