Science has ascribed to Substance certain characteristic qualities which it calls "Properties." It divides these properties into two classes, _viz._: (1) Molecular Properties (sometimes called Physical Properties); and (2) Atomic Properties (sometimes called Chemical Properties). _Molecular Properties_ are those which may be manifested by Substance without disturbing the Molecules, and consequently without affecting the "kind" of Substance. _Atomic Properties_ are those which concern the Atoms when free from Molecular combination, and which consequently cannot be manifested without changing the "kind" of Substance. Science, before long, is likely to add a third class of Properties, namely, "_Corpuscular Properties_," relating to the Corpuscles or particles of Radiant Matter, but, so far, it has not had the opportunity to sufficiently observe these qualities, except in a general way. There are certain General Properties that seem possessed by both Mass, Molecules, and Atoms--and probably by Corpuscles. These _General Properties_ are as follows: _Shape_: That property whereby Substance "takes up room." This property manifests in three directions, called Dimensions of Space, namely, Length, Breadth, and Thickness. _Weight_: That property whereby Substance responds to Gravity. Weight is simply the measure of the attraction. _Impenetrability_: That property whereby two bodies of Substance are prevented from occupying the same space at the same time. A nail driven into a piece of wood, simply pushes aside the molecules, and occupies the Space between them. Substance is never actually "invaded" or its actual territory occupied by other Substance. _Indestructibility_: That property whereby Substance is prevented from being destroyed or annihilated. Although the forms of Substance may be changed, or transformed into other forms, still, Substance _in itself_ is not destroyed, and cannot be under the existing Laws of the Universe.