Methods of biological assay. By J. H. Bu
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Article
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1928
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Wiley (John Wiley & Sons)
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## CHEMISTRY AND INDUSTHY 1117 or ia " energy levt~ls~" t,ltc ntonis of the inert gnses tnnrking t,hc siicocssivc coniplet.iott of thcsc clcctronic proupinp \\'IICII the outer litycr is incoinplcte, the clectsroiis forniiiig it. ditl'cr froin those of inner 1:iyers i i t that they nrc tiiticli ino