The section of land that was reserved for schools in the government (rectangular) survey system is number:

16

Explanation:

A rectangular system of land survey that divides a district into 24-square mile quadrangles from the meridian (north-south line) and the baseline (east-west line); the tracts are divided into 6-mile-square parts called townships, which are in turn divided into 36 tracts, each 1 mile square, called sections.