▁the ▁F ug ger ▁library . ▁ ▁Bar o que ▁ ▁In ▁ 1 7 2 2 , ▁Charles ▁VI , ▁Holy ▁Roman ▁Emperor ▁author ised ▁the ▁construction ▁of ▁a ▁permanent ▁home ▁for ▁the ▁library ▁in ▁the ▁Hof burg ▁palace , ▁after ▁the ▁plans ▁of ▁Leopold ▁I . ▁The ▁wing ▁was ▁begun ▁by ▁Johann ▁Bern hard ▁Fischer ▁von ▁Er lach ▁and ▁started ▁accommod ating ▁the ▁library ▁in ▁the ▁ 1 8 th ▁century . ▁ ▁The ▁most ▁valuable ▁addition ▁at ▁that ▁time ▁was ▁the ▁extensive ▁collection ▁of ▁Prince ▁Eug ene ▁of ▁Sav oy , ▁whose ▁ 1 5 , 0 0 0 ▁volumes ▁included ▁valuable ▁books ▁from ▁France ▁and ▁Italy . ▁The ▁State ▁Hall ▁of ▁the ▁library ▁hous ed ▁about ▁ 2 0 0 , 0 0 0 ▁books ▁at ▁this ▁point . ▁ ▁During ▁the ▁re organ ization ▁there ▁was ▁for ▁the ▁first ▁time ▁criticism ▁regarding ▁the ▁fact ▁that ▁the ▁library ▁served ▁mainly ▁as ▁representation ▁rather ▁than ▁the ▁search ▁for ▁knowledge . ▁Doctor ▁Ger ard ▁van ▁Sw iet en , ▁phys ician ▁to ▁Maria ▁Th eres ia , ▁and ▁his ▁son ▁Gott fried ▁van ▁Sw iet en ▁supp lement ed ▁the ▁collection ▁with ▁numerous ▁scientific ▁works . ▁Gott fried ▁van ▁Sw iet en ▁also ▁successfully ▁introduced ▁the ▁card ▁index . ▁This ▁facil itated ▁the ▁continuous ▁updating ▁of ▁the ▁invent ory . ▁ ▁Aust rian ▁Empire ▁ ▁After ▁the ▁Holy ▁Roman ▁Empire ▁was ▁dissol ved ▁by ▁Napoleon ▁and ▁the ▁Aust rian ▁Empire ▁proc laimed ▁in ▁its ▁place , ▁the ▁library ▁was ▁again ▁re