For the purpose of this chapter, the practice of “chiropractic medicine” is defined as the science and art of mechanical and material healing as follows: the employment of a system of palpating and adjusting the articulations of the human spinal column and its appendages, by hand and electro-mechanical appliances, and the employment of corrective orthopedics and dietetics for the elimination of the cause of disease; provided, that chiropractic physicians may not write prescriptions for drugs for internal medication nor practice major surgery as defined in chapter 37 of this title.