▁to ▁discussion ▁in ▁the ▁critical ▁press ▁of ▁that ▁de cade ▁as ▁well , ▁before ▁it ▁was ▁first ▁published ▁in ▁ 1 9 3 4 . ▁Although ▁the ▁second ▁edition ▁was ▁significantly ▁longer , ▁the ▁two ▁ed itions ▁had ▁a ▁great ▁deal ▁of ▁similarity ▁of ▁content , ▁and ▁much ▁of ▁the ▁material ▁covered ▁in ▁the ▁volumes ▁is ▁consistent ▁not ▁only ▁with ▁one ▁another , ▁but ▁also ▁with ▁many ▁of ▁K elsen ' s ▁previous ▁writ ings ▁from ▁the ▁ 1 9 1 0 s ▁and ▁ 1 9 2 0 s . ▁The ▁following ▁sections ▁here in ▁shall ▁follow ▁K elsen ' s ▁own ▁preference ▁for ▁the ▁presentation ▁of ▁his ▁main ▁topics ▁of ▁the ▁pure ▁theory ▁of ▁law ▁as ▁he ▁presented ▁them ▁in ▁the ▁second ▁edition ▁of ▁this ▁book . ▁ ▁Chap ters ▁ ▁I . ▁Law ▁and ▁Nature ▁In ▁the ▁first ▁paragraph ▁of ▁P ure ▁Theory ▁of ▁Law , ▁K elsen ▁introdu ces ▁his ▁theory ▁as ▁being ▁a ▁theory ▁of ▁positive ▁law . ▁This ▁theory ▁of ▁positive ▁law ▁is ▁then ▁presented ▁by ▁K elsen ▁as ▁forming ▁a ▁hierarchy ▁of ▁laws ▁which ▁start ▁from ▁a ▁basic ▁norm ▁( G rund norm ) ▁where ▁all ▁other ▁norm s ▁are ▁related ▁to ▁each ▁other ▁by ▁either ▁being ▁inferior ▁norm s , ▁when ▁the ▁one ▁is ▁compared ▁to ▁the ▁other , ▁or ▁superior ▁norm s . ▁The ▁interaction ▁of ▁these ▁norm s ▁is ▁then ▁further ▁subject ▁to ▁representation ▁as ▁a ▁static ▁theory ▁of ▁law ▁( K elsen ' s ▁chapter ▁ 4 ) ▁or ▁as ▁a ▁dynamic