English Cholera.--In this disease all the symptoms of irritant poisoning are present. Pain in the belly, and vomiting. But in this disease the vomit and alvine discharges are _never_ bloody, most frequently bilious. _An acrid taste in the mouth and throat succeeds the vomiting._ This is due to the acrid nature of the vomited matters. The stools contain bile in English cholera; in irritant poisoning, sometimes blood. Death is rare within three days. Gastritis.--Acute idiopathic gastritis is so rare in this country as scarcely to need description. Most of the cases recorded of acute gastritis have been found to be due to irritants. We must, therefore, consider the period and order of the occurrence of the symptoms in relation to the last meal. Costiveness of the bowels would point to the presence of gastritis or enteritis, violent purging and vomiting to irritant poisoning. Enteritis.--Though more common than gastritis, enteritis is a rare disease. The bowels are generally _confined_. Tubercular and aphthous inflammation of the intestines may simulate irritant poisoning, especially chronic poisoning by arsenic. The _post-mortem_ and a chemical analysis will reveal the true cause of death. Peritonitis.--In the early stages of the disease vomiting is rare, and constipation is the rule, with marked tenderness over the whole abdomen. The morbid appearances in the peritoneum are seldom caused by irritants. Perforation of the Stomach.--The symptoms supervene immediately after a meal; the pain, which is very acute, gradually extending over the abdomen. In most cases the patient has suffered for some time previously from dyspepsia. Hernia.--Examine the seat of pain, the cause will be soon detected. But an omental hernia may be present, giving rise to twisting pain at umbilicus. Intussusception of the Bowels.--Pain, sudden and confined to one spot below the stomach. Vomiting is present _without_ purging, thus differing from diarrhœa and cholera. After a time the vomit becomes fæcal. Colic.--May be confounded with poisoning by the salts of lead. If lead be taken in large doses, it produces the symptoms common to irritant poisons added to those of colic. In chronic lead poisoning, the blue line round the gums, the aspect of the patient, and history of the case, will point to the true cause of the symptoms. Lead colic is also generally accompanied with extreme depression of spirits. Rupture of Internal Organs.--Rupture of the stomach, duodenum, gall-bladder, and impregnated uterus, is of rare occurrence. The autopsy will show the true cause of death. Table giving the names of Diseases the Symptoms of which resemble those the result of Narcotic Poisoning, together with such points of difference as may assist in distinguishing the one from the other: