1909 — The Meric system is developed by B. J. Palmer, DC, and James C. Wishart, DC, and includes dividing the body into zones and vertemeres.

The Meric theory of subluxation presumes a relationship between dysfunctions at particular spinal joints and specific diseases of particular organs. In this system, the doctor determines which organ is diseased by locating the subluxated vertebrae that correspond to the area of the disease.