On this constant anatomo pathological web, which defines the origin and general form of gastro enteritis, the processes proliferate: when irritation of the diges tive canal has spread more in extent than in depth, it causes a considerable bile secretion, and pain in the locomotor muscles: this is what Pinel called bilious fever; in a lymphatic subject, or when the intestine is filled with mucous, gastro enteritis takes on the form that was known as mucous fever; what was called adynamic fever is simply gastro enteritis that has reached such a degree of intensity that there is a reduction in strength, and a blunting of the intellectual powers.