The fact that when one organ is disordered in any way other organs sympathize, or suffer with it, is familiar to every one. This sympathy destroys the simplicity of disease, in two ways. In the first place, it produces many symptoms at a distance from the organ affected. Pain, for example, is often far away from the disease which causes it. The pain in the right shoulder from disease of the liver, in the knee from disease of the hip joint, and in the head from disordered stomach, are familiar instances. Convulsions, in the great majority of cases, especially in children, are a mere symptom developed by the sympathy of the brain and nervous system with disease in some other organ—for example, a disordered stomach, the irritation of teething, &c. Now if sympathy renders disease complex, by developing such marked symptoms as those we have mentioned, at a distance from the affected organ, much more will it do this by the numerous less observable, and less definite symptoms, attendant upon our various bodily maladies. In the second place, sympathy destroys the simplicity of disease, not only by exciting symptoms in organs at a distance from the part affected, but also by creating actual disease in those organs. A single example will suffice. The child, whose brain sympathizes with the disease in its stomach, may have inflammation after a time fastened upon its brain in consequence of this sympathy, the symptoms at first being obscure, but at length clear and unequivocal. The influence of sympathy in modifying disease occasions constantly much perplexity in the mind of the physician. He often finds it difficult, and sometimes impossible, to decide whether an organ, which he sees to be affected, is really diseased, or is merely sympathizing with some other organ.