Maple syrup producers judge the quality of a sugarbush tree based on two characteristics: total volume and sugar content of the sap yielded by the tree during the tapping season. Larger sap volumes and sugar contents are directly correlated with higher syrup production. In 1946, C.H. Jones, a researcher at the University of Vermont, developed an equation for estimating the volume of sap required to produce one gallon of maple syrup. Known as “Jones Rule,” this equation has been revised over the years to accommodate changing maple syrup standards and is presented below in its current formulation.