The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . COOH COOH L/tVO-ROTKTORY. COOH\Nf\.CTlVt IlG. 7. )IG. 8. Constitution of the Isomers of Tartaric Acid. Fig. 9. any one of three essentially different arrange-ments, for representing the relations expressedby the foregoing structural formula. These areshown in Figs. 7, 8, and 9. It will be observed,in Fig. 7, that the radicals and atoms that areattached to the vertices are so situated that thetwo tetrahedra would be supcrposable in allrespects
The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . COOH COOH L/tVO-ROTKTORY. COOH\Nf\.CTlVt IlG. 7. )IG. 8. Constitution of the Isomers of Tartaric Acid. Fig. 9. any one of three essentially different arrange-ments, for representing the relations expressedby the foregoing structural formula. These areshown in Figs. 7, 8, and 9. It will be observed,in Fig. 7, that the radicals and atoms that areattached to the vertices are so situated that thetwo tetrahedra would be supcrposable in allrespects, if they were separated from each to stereo-chemical theory, this signi-fies that the compound that Fig. 7 representswill rotate the plane of polarized lights Iiy anamount equal to the sum of the effects of thetwo constituent asymmetrical tetrahedra. Turn-ing now to Fig. 8, it will be seen that the twotetrahedra in this diagram also admit of super-position upon themselves, if they are separated ;and hence the compound lliat this diagram will also rotate tlic plane of polarizationby an amoimt that is et|ual to the sum of theeffects that an- due
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