PTOMAINES OR CADAVERIC ALKALOIDS.—Much attention has been attracted lately by the possible interference to toxicological detections owing to the undoubted existence of natural alkaloids in the dead body unpoisoned. Some of these, called by Selmi “Ptomaines” ([Greek: ptôma], a corpse), somewhat simulate strychnia, &c., in their chemical and physiological characters. The observation is not new, as years ago, in the Privy Council’s reports, Thudichum called attention to alkaloids separated by Sonnenschein’s process (phosphomolybdic acid) from the brain, urine, and from decomposed bodies. Various substances of the kind have also been found by other investigators. To these “cadaveric alkaloids” have been attributed the “sausage poisoning,” so frequent in Germany (for cases, see Casper’s Handbook, vol. 3), poisoning by various foods, such as tinned meats, cheese, &c. Some are irritants, others narcotics: different periods and circumstances of putrefaction producing different compounds. In an Italian criminal prosecution, F. Ciotto, who made the investigation of the corpse, gave it as his opinion that strychnia was probably present. Selmi, for the defence, pointed out differences from strychnia, and considered the compound to be a ptomaine. [Arch. Pharm. (3), 19, 187.] This will show the importance of the subject. Casali (Gazetta, 1881, 312) regards ptomaines as not true alkaloids, but as “acid or basic amidated compounds.” It is only the basic ones that will interfere with testing. Panum and Bergmann have isolated a substance called “_sepsin_,” generated by putrefaction, poisonous, acting like a ferment but not destroyed by boiling, soluble in water, but insoluble in alcohol, and thereby distinguished from alkaloids. Sonnenschein and Zuelzer found a product of putrefaction which produced tetanic symptoms, besides one resembling atropine. But these substances, or similar ones, can be produced _without_ putrefaction, as Paterno and Spica have shown that fresh blood and fresh albumen (white of egg) yielded, with phosphomolybdic acid, potassio-mercuric iodide, and other alkaloidal reagents, precipitates like those of the vegetal alkaloids. Selmi has even supposed that death from various diseases may be due to the formation of these compounds. The same author obtained from a dead body one month after death a considerable amount of a _crystallizable_ ptomaine, giving reactions like those of alkaloidal poisons, and having poisonous effects on frogs.