Page:The Practice of Diplomacy - Callières - Whyte - 1919.djvu/71

 which prevail in different parts, and of the character of those princes, soldiers, and ministers who stand in positions of authority. In order to master the detail of such knowledge he must have an understanding of the material power, the revenues, and the whole dominion of each prince or each republic. He must understand the limits of territorial sovereignty; he must inform himself of the manner in which the government was originally established; of the claims which each sovereign makes upon parts which he does not possess; for these ambitions are the very material of negotiationon those occasions when a favourable turn of events prompts the ambitious sovereign to hope that a long-cherished desire may be realised; and, finally, the negotiator must be able to make a clear distinction between the rights and claims which are founded on treaty obligation and those which rest upon pure force alone. For his own inst instruction he must read with the most attentive care all public treaties, both general and particular, which have been made between the princes and states of Europe and in our time; he should consider the treaties concluded between France and the House of Austria as those which offer the principal form and model for the conduct of all the public affairs of Christendom on account of the network of liaisons with other sovereigns which surrounds these two