[66] Heffter, par. 7, p. 14: “With respect to non-Christian states, which are not yet regularly admitted into the bosom of the European family, the application of the same law is entirely free, and founded upon a purely conventional reciprocity. Relations with them are formed according to the exigencies of policy and morality.”
[67] Droit de gens moderne, par. 20.
[68] Einleitung in das positive europaïsche Völkerrecht, Gottingen, 1796, p. 1.
[69] Droit des gens moderne, par. 21.
[70] Droit des gens moderne, par. 23.
[71] Einleitung in das positive europaïsche Völkerrecht, par. 31.
[72] Droit des gens moderne de l’Europe, par. 25.
[73] See Charles Calvo, Manuel du droit international public et privé, par. 49, p. 85; also his Droit international theorique et pratique, vol. i., p. 320.
[74] Précis du droit des gens, Paris, 1877, No. X., p. 23.
[75] See on this point, International Law, by Edward W. Hall, M.A., barrister-at-law, Oxford, 1880, par. 35, p. 100.