In cases of =suspected poisoning= especial attention should be paid to the condition of the gastro-intestinal tract (position, distention, odor, consistence, condition of blood-vessels, etc.). A ligature should be placed about the cardiac end of the stomach and another around the duodenum below the mouth of the common duct, and both organs removed. They should then be opened outside the body and the contents examined (amount, consistence, color, composition, reaction, odor), and the latter then placed in clean, sterilized glass or porcelain jars, which are sealed and labeled. The mucosa of the organ is then carefully examined and described, and the organ itself finally preserved in a sealed and labeled jar. The small and large intestines and the œsophagus are similarly ligatured, removed and examined, and with their contents are preserved for chemic reaction by sealing them in separate sterilized jars properly labeled. Blood from the heart and large veins should be saved for spectroscopic and chemic examination. The contents of the urinary bladder likewise are saved for chemic analysis. Finally, portions of the brain, liver, kidney, intestine, spleen and other organs and tissues are preserved in separate vessels for chemic and microscopic examination. When possible an expert chemist should be present at the autopsy and receive the organs and contents directly from the pathologist. Especial care must be taken that no contamination of the material can occur. The manner of removal of the organs, the character and condition of the instruments used, nature and condition of receptacles for material, manner of sealing, use of preservatives, method of transportation to the chemist, and other fine points of detail will all be threshed over in court in the endeavor to discredit the testimony, and the pathologist and chemist must be thoroughly prepared to meet all questions of this nature. In certain cases the presence of a poison may be told by the finding of a granular or crystalline substance in the stomach or intestines (arsenic-poisoning), by the color (green from aceto-arsenite of copper, yellow from potassium chromate or iodin, purple from iodin, red from bromin) or by the odor (bitter almonds, phosphorus, alcohol, chloroform, laudanum, carbolic acid, lysol, garlic in arsenic poisoning). Excessive acidity or alkalinity of the stomach contents is found in poisoning with acids, alkalies or potassium cyanide. Portions of poisonous plants, mushrooms, match-heads, etc., may be found in the stomach.