Sympathetic communication through the organism is sometimes carried out by a locally assignable relay (the diaphragm for spasms, the stomach for the discharge of humour); sometimes by a whole system of diffusion that radiates through the body (the nervous system for pains and convulsions, the vascular system for inflammations) in other cases, by means of a simple functional correspondence (a suppression of the excretions is communicated from the intestines to the kidneys, and from these to the skin);