It is always advisable while laying down any rule whereby human actions are framed, to ascertain the basis on which such principle or rule rests. Such an inquiry is by no means useless in dealing with the science of international law, even though one may regard this branch of knowledge as being merely “positive”; for the conduct of states, just as that of individuals, is generally modelled according to some idea or principle. It will not be unprofitable, therefore, to begin this study with a note, short as it must necessarily be, on the grounds of the liability of states, so that in this manner it may become comparatively easy to ascertain what are the rights of states whose citizens or subjects have suffered damages in the course of riots or insurrections that have taken place in a foreign country.