▁but ▁due ▁to ▁the ▁financial ▁problems ▁and ▁the ▁lack ▁of ▁a ▁labor atory , ▁he ▁did ▁not ▁undert ake ▁this ▁job . ▁In ▁ 1 9 2 1 ▁he ▁obtained ▁a ▁success ive ▁hab il itation ▁at ▁the ▁University ▁of ▁Zur ich ▁( review ers : ▁Ed gar ▁Meyer ▁and ▁Er win ▁Sch r öd inger ). ▁ ▁In ▁ 1 9 2 2 ▁Wolf ke ▁got ▁a ▁position ▁of ▁professor ▁at ▁the ▁Wars aw ▁University ▁of ▁Technology ▁and ▁returned ▁to ▁Poland . ▁At ▁the ▁Wars aw ▁University ▁of ▁Technology ▁he ▁led ▁the ▁Department ▁of ▁Physics ▁on ▁the ▁Fac ulty ▁of ▁Elect rote chn ics . ▁In ▁ 1 9 2 4 ▁he ▁started ▁the ▁co operation ▁with ▁the ▁Institute ▁of ▁Low ▁Tem per atures ▁in ▁Le iden . ▁ ▁In ▁ 1 9 2 6 ▁his ▁second ▁son , ▁Stefan ▁Wolf ke , ▁was ▁born . ▁ ▁In ▁the ▁early ▁th irt ies , ▁Wolf ke ▁started ▁to ▁organ ize ▁the ▁Low ▁Tem per atures ▁Institute . ▁In ▁ 1 9 3 8 ▁he ▁took ▁part ▁in ▁the ▁organization ▁of ▁the ▁flight ▁of ▁Polish ▁str atos pher ic ▁bal lo on ▁called ▁" Star ▁of ▁Poland ". ▁The ▁first ▁flight ▁was ▁un success ful ▁and ▁the ▁second ▁one ▁was ▁pre cluded ▁by ▁the ▁World ▁War ▁II . ▁ ▁After ▁the ▁beginning ▁of ▁the ▁World ▁War ▁II ▁Wolf ke ▁was ▁arrested ▁( 1 0 @ th ▁November ▁ 1 9 3 9 ), ▁sent ▁to ▁P aw iak ▁where ▁he ▁spent ▁a ▁week