1 9 1 5 . ▁ ▁History ▁ ▁In ▁April , ▁ 1 9 0 2 , ▁on ▁the ▁campus ▁of ▁N ortheast ▁Missouri ▁State ▁University , ▁four ▁girls ▁formed ▁a ▁" friend ship ▁club ". ▁The ▁club ▁grew ▁to ▁nine ▁members ▁and ▁the ▁name ▁T . T . C . ▁was ▁adopted . ▁When ▁the ▁club ▁grew ▁to ▁twelve ▁members , ▁the ▁name ▁was ▁changed ▁to ▁A . O . T . ▁It ▁is ▁reported ▁that ▁one ▁member ▁" could ▁not ▁keep ▁her ▁p ledge ", ▁so ▁a ▁more ▁" per man ent " ▁organization ▁was ▁formed . ▁Thus ▁begins ▁the ▁Al pha ▁chapter ▁of ▁S igma ▁D elta ▁Chi ▁sor or ity . ▁ ▁In ▁the ▁summer ▁months ▁of ▁ 1 9 0 2 , ▁the ▁" init iat ory ▁and ▁christ ening ▁service " ▁were ▁craft ed , ▁along ▁with ▁important ▁documents . ▁In ▁the ▁fall ▁of ▁ 1 9 0 2 , ▁the ▁B eta ▁Chapter ▁at ▁W arr ens burg ▁Te ach ers ▁College ▁( Cent ral ▁Missouri ) ▁was ▁char tered . ▁Two ▁years ▁later , ▁the ▁G amma ▁chapter ▁was ▁char tered ▁at ▁Forest ▁Park ▁Academy ▁and ▁D elta ▁at ▁North west ▁Missouri ▁State ▁University . ▁ ▁Con cla ves ▁were ▁held ▁every ▁two ▁years , ▁beginning ▁in ▁ 1 9 0 6 . ▁The ▁final ▁conc lave , ▁in ▁ 1 9 1 2 , ▁ruled ▁that ▁the ▁sor or ity ▁would ▁only ▁char ter ▁at ▁normal ▁schools . ▁The ▁G amma ▁chapter ▁was ▁lost