The study of medicine is divided into four subjects, namely

I. Pathology: that part of medical science which studies disease.

A. Etiology: the investigation of morbific causes.

B. Pathogeny: an explanation of the mode of action of causes-how cause produces the development of disease.

C. Pathological Physiology: morbid reactions under disease-producing causes.

D. Pathological Anatomy: which reveals the structural change resulting from disease.

E. Symptomatology: which accounts for disturbances.

F. Nosology: which describes and classifies disease.

II. Diagnosis: which determines the place where a given disease belongs in Nosology.

III. Prognosis: which fortells the outcome of disease.

IV. Therapeutics: which endeavors to relieve, modify, and cure disease.