The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . the compounds that arerepresented by Figs. 7 and 8 will rotate theplane of polarization by equal amounts, but inopposite directions. Fig. 7 may therefore betaken to represent dextro-rotatory tartaric acid,while Fig. 8 represents the Isvo-rotatory va-riety of the same substance. In the config-uration shown in Fig. 9, it will be observedthat the two tetrahedra, if separated, cannot besuperposed; for they are enantiomorphic, orrespectively right
The Americana; a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc., of the world . the compounds that arerepresented by Figs. 7 and 8 will rotate theplane of polarization by equal amounts, but inopposite directions. Fig. 7 may therefore betaken to represent dextro-rotatory tartaric acid,while Fig. 8 represents the Isvo-rotatory va-riety of the same substance. In the config-uration shown in Fig. 9, it will be observedthat the two tetrahedra, if separated, cannot besuperposed; for they are enantiomorphic, orrespectively right-handed and left-handed. Ac-cording to the theories of stereo-chemistry, oneof these tetrahedra tends to cause the planeof polarization of polarized light to rotate tothe right, while the other tends to rotate itby an equal amount to tlie left; and hence thesubstance, as a whole, will be optically addition to these three varieties of tartaricacid (all of which are known and can be ac-tually prepared), there is a fourth variety whichis optically inactive, but which is not reallychemically distinct from the varieties that have COOH COOH. COOH DtXTK0-ROT\TORY
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