It appears that W means White, F.C. means Free Colored and S means slaves. Note that the Post Offices in Tippah Co. were Springhill, Salem, Ripley, Tippahville and Alberson which is now New Albany, county seat of Union County. The change in the Mississippi and Tennessee line is also shown. This map shows township and range though you have to kind of figure it out for yourself. The Chickasaw meridian runs down the west side of Tippah and the east side of Marshall.
Ranges are number as east and west of the meridian and are shown in roman numerials.
Townships run north and south but the numbers aren't shown on the map. They start at the old state line at 1. Each square is 6 by 6 miles and a section is a mile square. Salem for instance would be in Range 1 East, Township 3 South. Ripley would be in Range 3 East, Township 4 South.