▁inst itute ▁offering ▁social ▁research ▁services ▁to ▁public ▁and ▁private ▁clients ▁( Z ak ład ▁B ada ń ▁Nau kow ych ▁P TS ). ▁The ▁proceed s ▁from ▁its ▁work ▁contribute ▁to ▁the ▁P TS ▁budget . ▁ ▁History ▁ ▁In ▁its ▁present ▁form , ▁the ▁P TS ▁has ▁had ▁a ▁continuous ▁existence ▁since ▁ 1 9 5 6 , ▁but ▁its ▁history ▁can ▁be ▁trac ed ▁back ▁to ▁ 1 9 2 7 , ▁when ▁Flor ian ▁Z n anie cki ▁established ▁the ▁first ▁Polish ▁organization ▁of ▁soci olog ists ▁under ▁the ▁name ▁of ▁" Pol ish ▁Soci ological ▁Institute " ▁( Pol ski ▁Inst yt ut ▁Soc j olog icz ny / PI S ). ▁Initial ly , ▁the ▁P IS ▁combined ▁the ▁tasks ▁of ▁a ▁research ▁inst itute ▁with ▁the ▁representation ▁of ▁soci olog ists ▁across ▁the ▁country . ▁In ▁ 1 9 3 1 , ▁on ▁the ▁first ▁ever ▁national ▁convention ▁of ▁soci olog ists ▁in ▁Poz na ń , ▁separate ▁professional ▁organization ▁under ▁the ▁name ▁of ▁Pol skie ▁Tow arz yst wo ▁Soc j olog icz ne ▁( PT S ) ▁was ▁created ▁on ▁Z n anie cki ' s ▁initi ative . ▁This ▁association , ▁one ▁of ▁the ▁first ▁of ▁its ▁type ▁in ▁Europe , ▁co - ex isted ▁with ▁the ▁P IS . ▁Rel atively ▁little ▁is ▁known ▁about ▁its ▁activities . ▁Its ▁first ▁two ▁pres idents ▁were ▁Lud wik ▁Kr zy wick i ▁( 1 9 3 1 - 1 9 3 5 ) ▁and