His progress was slow -- he was attacking the mighty osage orange with hand tools.
Osage orange, also known as mock orange, is nearly rock hard. When used for firewood, it is reputed to offer more BTUs per chord than any other Eastern hardwood tree species. (In second place ranks the shagbark hickory.)
Look up your favorite firewood here:
-A chord is defined as the the amount of tightly piled wood in a stack 4 feet wide and 4 feet high by 8 feet long.
-A BTU, or British Thermal Unit, is the amount of heat required to raise one pound of water one degree Fahrenheit.