Such a system possesses a double purpose. In the first place, it could, I think, be used in our present natural languages. Certain English expressions occurring in electrotechnics, such as _shunt_, _extra current_, are employed in German and French just as if they were national words. The international names in their international form might be employed in every case where a precise scientific terminology was required, without doing much violence to our natural languages. The inflow of foreign words through the channels of technology and science as well as those of commerce and music has already shown itself to be irresistible, so that a strict carrying out of the principle of "purity" in our national languages has been a practical impossibility. In literature properly so called one will endeavour nevertheless to adhere to this principle, but where the chief question is one of precision of concepts, as in science, language must be regarded as a handmaiden, whose first duty is to obey. For language stands only in a secondary relationship to the independently developed and determined concepts of science, which have been already fixed by the symbols assigned to them, just in the same way that language has fixed the concepts of daily life. Independent of the above application, which one may or may not consider practical, is the internationalisation of scientific publications by means of a universally understood auxiliary language, which is becoming every day more urgently necessary. This problem, too, cannot be attacked until the concepts of all the sciences in question have received their proper designations. The existing dictionaries of international auxiliary languages contain mostly the expressions of daily life, so that at present these languages are mainly applicable only for such communications. Some success can indeed be obtained in the expression of the higher trains of thought of philosophical reasoning, but here already considerable uncertainty exists. It is clear, for instance, that a paper in organic chemistry can only be successfully written in the international language after the translations of the different names for substances occurring in different languages have been mutually agreed upon. Consequently the working out of the concepts of the different sciences and the determination of their international designations is the very first task which must be performed before the further objects, international literature and international oral intercourse in science, can be considered. It is the duty therefore of the representatives of science who have joined the _Uniono di l'Amiki di la Linguo Internaciona_ to apply themselves in the first place to this problem, since the further success of the whole question depends entirely on its at least provisional solution.