Full Idea
On one version of Quantity realism it is what makes a body have parts; on another version, it is what makes the body's parts be spread out in a continuous and unified way.
Gist of Idea
Scholastic Quantity either gives a body parts, or spreads them out in a unified way
Source
Robert Pasnau (Metaphysical Themes 1274-1671 [2011], 14.1)
Book Reference
Pasnau,Robert: 'Metaphysical Themes 1274-1671' [OUP 2011], p.280