▁first ▁production ▁of ▁Jan á č ek ' s ▁Jen ů fa ▁in ▁Zag reb ▁in ▁ 1 9 2 0 . ▁ ▁He ▁was ▁appointed ▁Director ▁of ▁Opera ▁at ▁the ▁National ▁Theatre ▁in ▁Br no , ▁Czech oslov ak ia ▁in ▁ 1 9 3 2 , ▁remaining ▁there ▁until ▁ 1 9 3 8 . ▁ ▁In ▁ 1 9 3 3 ▁in ▁Br no ▁he ▁conducted ▁the ▁world ▁premi ere ▁of ▁the ▁bal let ▁S vat ba , ▁set ▁to ▁Stra vin sky ' s ▁Les ▁n oc es , ▁ch ore ography ▁by ▁M áš a ▁C ve j ic ová . ▁ ▁That ▁same ▁year ▁ 1 9 3 3 ▁saw ▁Sach s ▁conduct ▁the ▁first ▁performance ▁in ▁Br no ▁of ▁K á ť a ▁K aban ová ▁since ▁the ▁ 1 9 2 8 ▁death ▁of ▁its ▁composer ▁Jan á č ek . ▁ ▁It ▁is ▁clear ▁from ▁the ▁mark ings ▁on ▁the ▁scores ▁held ▁there ▁that ▁Sach s ▁disp ensed ▁with ▁the ▁practice ▁of ▁linking ▁scenes ▁in ▁the ▁opera ▁by ▁way ▁of ▁extended ▁inter l udes . ▁ ▁On ▁ 4 ▁October ▁ 1 9 3 6 , ▁in ▁Br no , ▁Sach s ▁conducted ▁the ▁world ▁premi ere ▁of ▁D vo ř ák ' s ▁Sym phony ▁No . ▁ 1 ▁in ▁C ▁minor , ▁The ▁B ells ▁of ▁Z lon ice . ▁ ▁The ▁work ▁was ▁written ▁in ▁ 1 8 6 5 , ▁but ▁for ▁almost ▁ 6 0 ▁years ▁had ▁been ▁believed