strength with the least weight. The end of the tail is a
flexible lash, which would probably be used as a weapon, like the tail
of some existing lizards. The feet, notwithstanding the weight they had
to support, are as unsymmetrical as those of a crocodile, with claws
only on the three inner toes. There is no external armour.

See O. C. Marsh, _Amer. Journ. Sci._ ser. 3, vol. xvi. (1878), p. 414,
pl. viii., and loc. cit. vol. xxvii. (1884), p. 161, pls. iii., iv.;
H. F. Osborn, Mem. _Amer. Mus. Nat. Hist._ vol. i. pt. v. (1899); J.
B. Hatcher, _Mem. Carnegie Mus._ vol. i. No. 1 (1901), and vol. ii.
No. 1 (1903); W. J. Holland, _Mem. Carnegie Mus._ vol. ii. No. 6
(1906). (A. S. Wo.)

DIPLOMACY (Fr. _diplomatie_), the art of conducting international
negotiations. The word, borrowed from the French, has the same
derivation as Diplomatic (q.v.), and, according to the _New English
Dictionary_, was first used in England so late as 1796 by Burke. Yet
there is no other word in the English language that could supply its
exact sense. The need for such a term was indeed not felt; for what we
know as diplomacy was long regarded, partly as falling under the _Jus
gentium_ or international law, partly as a kind of activity morally
somewhat suspect and incapable of being brought under any system.
Moreover, though in a certain sense it is as old as history, diplomacy
as a uniform system, based upon generally recognized rules and directed
by a diplomatic hierarchy having a fixed international status, is of
quite modern growth even in Europe. It was finally established only at
the congresses of Vienna (1815) and Aix-la-Chapelle (1818), while its
effective extension to the great monarchies of the East, beyond the
bounds of European civilization, was comparatively an affair of
yesterday. So late as 1876 it was possible for the writer on this
subject in the 9th edition of the _Encyclopaedia Britannica_ to say that
"it would be an historical absurdity to suppose diplomatic relations
connecting together China, Burma and Japan, as they connect the great
European powers."

_Principles._--Though diplomacy has been usually treated under the head
of international law, it would perhaps be more consonant with the facts
to place international law under diplomacy. The principles and rules
governing the intercourse of states, defined by a long succession of
international lawyers, have no sanction save the consensus of the
powers