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2 and as little harm in war, as possible, without injury to their true interests. But, as the precepts of this code are not defined in every case with perfect precision, and as nations have no common civil tribunal to resort to for the interpretation and execution of this law, it is often very difficult to ascertain, to the satisfaction of the parties concerned, its precise injunctions and extent; and a still greater difficulty is the want of adequate pacific means to secure obedience to its dictates.

There has been a difference of opinion among writers, concerning the foundations of the law of nations. It has been considered by some as a mere system of positive institutions, founded upon consent and usage; while others have insisted that it was essentially the same as the law of nature, applied to the conduct of nations, in the character of moral persons, susceptible of obligation and laws. We are not to adopt either of these theories as exclusively true. The most useful and practical part of the law of nations is, no doubt, instituted or positive law, founded on usage, consent, and agreement. But it would be improper to separate this law entirely from natural jurisprudence, and not to consider it as deriving much of its force, and dignity, and sanction, from the same principles of right reason, and the same view of the nature and constitution of man, from which the science of morality is deduced. There is a natural and a positive law of nations. By the former, every state, in its relations with other states, is bound to conduct itself with justice, good faith, and benevolence; and this application of the law of nature has been called by Vattel, the necessary law of nations, because nations are bound by the law of nature to observe it; and it is termed by others, the internal law of nations, because it is obligatory upon them in point of conscience.

We ought not, therefore, to separate the science of public law from that of ethics, nor encourage the dangerous