Water spreads on a glass surface but it forms beads on a glass surface polished by paraffin-why?

Explanation

Adhesive forces between the molecules of glass and water are stronger than the cohesive forces between the water molecules. For this reason, water can spread on the glass surface. On the other hand, adhesive forces between the molecules of paraffin (non-polar) and water are weaker than cohesive forces between the water molecules. for this reason, water forms small beads on a glass surface polished by paraffin.