Dr. Zamenhof has given us an interesting account of the way in which his language gradually developed in his mind while he was at the Warsaw Gymnasium. Before he arrived at the conviction that the material for the vocabulary must be obtained from the Romance and Germanic languages, and that the already existing stock of international words must be used, he had "simply invented" his words, that is to say, chosen them quite arbitrarily, but with as much regard to system and brevity as possible. Although he himself noticed that such words are difficult to learn and still more difficult to remember, he has unfortunately retained in the finished language a whole series of such _à priori_ formations, which appear in words of such frequent occurrence as _who_, _how_, _where_, _never_, _everywhere_, etc. The _nul tempe_ and _pro quo_ chosen by the Delegation agree, however, much better with the general character of language than the _neniam_ and _kial_ of Dr. Zamenhof. Some peculiarities may be accounted for by the Slavonic mother tongue of the author: for example, his preference for sibilants and diphthongs, which is especially evident in the invented words (_e.g._, _chi_, here; _chiu_, each; _ech_, even; _ghi_, that; _ghis_, until, _gh_ and _ch_ being pronounced as E. _j_ and _ch_). In an article in Zamenhof's _Krestomatio_ I find, for example (p. 288), _chiuj tiuj senantaujughaj kaj honestaj homoj_, _kiuj_, _anstatau filizofadi pri ghi_, and (p. 293) _tion chi ankorau antau la apero de la unua arta lingvo antauvidis kaj antaudiris chiuj tiuj eminentaj kapoj_, _kiuj_, etc. The method of writing _x_ is also Russian: _ekzameni_, _ekzemplo_, etc., and also _ekspedi_, _eksplodi_; also _kv_ for _qu_. French words with _oi_ take _ua_ in Esperanto when they are spelt in this way in Russian, _e.g._, _trotuaro_, _tualeto_, _vuala_; otherwise they are spelt with _oi_ or _oj_, _e.g._, _foiro_, _fojo_, _foino_. _Nacio_, _tradicio_, etc., instead of _-iono_, is also Russian. Russian usage has doubtless also inspired such word formations as _elparoli_ and _senkulpigi_ instead of the international _pronuncar_ and _exkuzar_ (R. _vygovarivat'_ and _izvin'at'_, corresponding to G. _aussprechen_ and _entschuldigen_). The peculiarity of using the adverb instead of the adjective in such cases as _estas necese vidi_, "it is necessary to see," is probably to be ascribed to the correspondence of the Russian adverb with the neuter predicate adjective. This rule cannot be permitted, however, in an international language, because, with a free word order, it would be impossible to say whether _estas vere necese_ means "it is really necessary" or "it is necessarily true." The compound perfect (_mi estas aminta_, "I have loved" = "I am having loved") reminds one of the Polish _kochal-em_. Finally, the frequent use of the adjective (in _-a_) instead of the genitive (_Zamenhofa lingvo_) and of the two sorts of action expressed by _ek_ and _ad_ (_ekvidi_