PROCEEDINGS OF LEARNED SOCIETIES.

다국어 초록 (Multilingual Abstract)

IT often happens, says the author, that in the first stages of a new discovery, the terms that are resorted to, in order to designate the materials of which it is composed, are vague and uncertain. Sometimes, a single term is applied to things that are not the same-and sometimes the terms are multiplied, because the things, although the same, are represented under different points of view.