Poison is forbidden in war, says the Berlin Conference; but so it always was, even in the Institutes of Menu, and with perhaps less difference of opinion in ancient than in modern times. Grotius and Vattel and most of their followers disallow it, but two publicists of grave authority defend it, Bynkershoeck and Wolff. The latter published his ‘Jus Gentium’ as late as 1749, and his argument is worth translating, since it can only be met by arguments which equally apply to other modes of military slaughter. ‘Naturally it is lawful to kill an enemy by poison; for as long as he is our enemy, he resists the reparation of our right, so that we may exercise against his person whatever suffices to avert his power from ourselves or our possessions. Therefore it is not unfair to get rid of him. But, since it comes to the same thing whether you get rid of him by the sword or by poison (which is self-evident, because in either case you get rid of him, and he can no longer resist or injure you), it is naturally lawful to kill an enemy by poison.’ And so, he argues with equal force, of poisoned weapons.[13] That poison is not in use in our day we do not therefore owe to our international lawyers, but to the accident of tradition. In Roman history the theory appears to have been unanimous against it. ‘Such conduct,’ says the Roman writer Florus of a general who poisoned some springs in order to bring some cities in Asia to a speedier surrender, ‘although it hastened his victory, rendered it infamous, since it was done not only against divine law, but against ancestral customs.’[14] Our statesman Fox refused indignantly to avail himself of an offer to poison Napoleon, but so did the Roman consuls refuse a similar proposal with regard to Pyrrhus; and Tiberius and the Roman senate replied to a plan for poisoning Arminius, that the Roman people punished their enemies not by fraud or in secret, but openly and in arms.