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Elements of Pharmacy.

Part I.

6. The most minute particles into which bodies can ultimate-ly be divided are called their Elementary particles.

7. When the integrant particles admit of no further division,the body is a Simple Substance.

8. But the integrant particles of most bodies can be subdi-vided into other particles, differing in their nature from eachother, and from the body of which they are parts. These areCompound Bodies.

9. If the particles, of which the integrant particles of anycompound body are composed,

a. admit of no further division, the body is a PrimaryCompound ;

b. but if they be also compound, and admit of still furthersubdivision, they are called Intermediate particles, andthe body is a Secondary Compound.

10. Therefore the integrant particles

a. of simple substances are also their elementary particles;

b. of primary compounds are composed of elementary par-ticles ;

c. of secondary compounds are composed of intermediateparticles.

11. The phenomena of matter are regulated by attractionand repulsion.

ATTRACTION.

12. Attraction comprehends those forces which cause bodiesto approach towards each other.

13. It operates

a. at sensible distances, as in the attractions of gravity,electricity, and magnetism ;

b. at insensible distances; Contiguous Attraction.

a. a. between particles of the same species, constitutingthe attraction of cohesion or aggregation ,■

b. b. between particles of different species, the attractionof composition or affinity.

REPULSION.

14. Repulsion tends to separate bodies from each other.

15. It also operates either

a. at sensible distances, as in the repulsion of electricityand magnetism ,• or,

b. at insensible distances, as in the repulsion of the matterof heat or caloric.