The toxic alkaloid of Amanita _phalloides_ Fries (Amanita _bulbosa_) was examined by Boudier, who named it "_bulbosin_," and by Ore, who named it "_phalloidin_," but their examinations, it is claimed, proved little beyond the fact that it seemed to be in the nature of an alkaloid, identical neither with _muscarin_ nor _helvellic_ acid. Ore affirmed that the _phalloidin_ of the Amanita phalloides was very nearly related to, and perhaps identical with, strychnine. From this view Kobert and others dissent. The poisonous principle of Amanita _phalloides_ has recently been subjected to very careful analysis by Prof. Kobert. As a result of a large number of experiments and post-mortem examinations held on persons poisoned by A. _phalloides_, Kobert states that the symptoms can be explained uniformly by the action of a poison, to which he gives the provisional name of "_phallin_." This is an albuminous substance which dissolves the corpuscles of the blood, resembling in this and other respects in a remarkable degree the action of _helvellic_ acid. According to Kobert _phallin_ has so far only been found in Amanita _phalloides_ and in its varieties _verna_, _mappa_, etc. He finds also in this mushroom muscarin and an atropin-like alkaloid. The symptoms of the phalloides poisoning are complex. Vomiting is accompanied by diarrhoea, cold sweats, fainting at times, convulsions, ending in coma. There is also fever and a quickening of the pulse. All these symptoms, which follow in succession, according to one author, are dependent on two different poisonous substances. The first may be an acrid and fixed poison, for it is found after repeated dryings, as well in the aqueous as in the alcoholic extract. The second acts by absorption, and is purely narcotic. Phallin has some of the properties of the toxalbumin of poisonous spiders, and is a vegetable toxalbumin. It has been remarked that in cases of poisoning by A. _phalloides_, the mushroom has tasted very good, and those poisoned felt well for several hours after eating. Phalloides poisoning is said to bear a marked resemblance to phosphorus poisoning and to acute jaundice. There is no known antidote to the poisonous alkaloid _phallin_. According to Prof. Kobert's analyses, the proportion of phallin in the dried mushroom amounts to less than 1%, but its effect on account of its concentration is the more intensive. Extensive experiments made by Kobert with ox blood in regard to the comparative action of different substances in their power of dissolving the red blood corpuscles demonstrate that _phallin_ in this respect exceeds all known substances. Kobert states that "If _phallin_ be added to a mixture of blood with a 1% solution of common salt, using the blood of man, cattle, dogs, or pigeons, the blood corpuscles will be entirely dissolved by the poison diluted to 1-125,000."