36 GENERAL LAWS OF CORPUSCULAR ATTRACTION.

3. The integrant parts of wax, tallow, suet, or lard, maybemade to change their situations, with a less degree of force thanthe former.

In these substances the motion of one particle of the bodyis not necessarily followed by that of all the rest, neither does thatmotion destroy the cohesion, nor break them.

4. The particles of water, spirit, and ether, move or slide overeach other very readily ; hence their resistance is considerablyless.

5. And lastly, vapours, the air of the atmosphere, and all thegases yield to the slightest possible impulse.

Law III ...Corpuscular attraction may be annihilated by everyeff ort which tends to separate the particles of bodies.

It need hardly be mentioned that all mechanical forces, suchas grinding, cutting, filing, rasping, pounding, breaking, &c. areof this nature.

In all these cases the force applied must be more than equal 1to the force of corpuscular attraction ; and as it was stated beforethat the corpuscular attraction acts with different degrees of forcebetween the particles of different bodies, so different degrees offorce are necessary to destroy that corpuscular attraction in diffe-rent bodies.

Hence chalk is more easily reduced to powder than flint;wood is easier broken than lead; lead easier than iron, &c.