This section is from the book "Health Without Medicine. A Treatise On The Laws Of The Human System", by Larkin B. Coles. Also available from Amazon: Philosophy Of Health.
The stomach is the most important organ of digestion. It has three coats; that which has most to do with digestion is the mucous coat, which lines it. This coat is supposed to furnish by its glands what is called gastric juice; which is the principal agent of digestion in the stomach.
The stomach is abundantly supplied with nerves, and holds a very powerful sway over the whole nervous system; so that when the stomach is under the influence of disease, either acute or chronic, the whole system is immediately in a state of suffering. To secure, then, a healthy system, the stomach must be kept in health.