Each tree will give two gallons of sap in 24 hours.

That's a good run. It takes 50 gallons of sap to make one gallon of syrup.

If I had eight hours to chop down a tree, I'd spend six hours sharpening the ax.

I looked up my family tree and found out I was the sap.

I don't have to look up my family tree, because I know that I'm the sap.

General principles... are to the facts as the root and sap of a tree are to its leaves.