. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. PROGRESS IN CHEMISTRY. 251 by an atom of hydrogen. This represents the solid or stereochemical t'orunda of methane or marsh gas. Now, suppose one of the atoms of hydi'og-en in each of these structures to be replaced by chlorine, the group (OH), or any other monovalent element or group. It is evident that, if not exactly similar (owing to the replacement not having been made at similar corners in each), the two structures can be made simi- l
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. PROGRESS IN CHEMISTRY. 251 by an atom of hydrogen. This represents the solid or stereochemical t'orunda of methane or marsh gas. Now, suppose one of the atoms of hydi'og-en in each of these structures to be replaced by chlorine, the group (OH), or any other monovalent element or group. It is evident that, if not exactly similar (owing to the replacement not having been made at similar corners in each), the two structures can be made simi- lar by turning one of them round mitil the position of the substituting atom or group (which we will term X) coincides in position with X in the stationary one. If two such replacements be made, say with X and Y in each, coincidence can again lie made to take place; but the same is not the case if X, Y, and Z replace the three atoms of h3"dro- gen in the structure; for there is one way of replacement which is the optical image of the other and represents the other's reflection in a mirror, X X and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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