i ▁from ▁a ▁copy ▁held ▁by ▁Ag n olo ▁di ▁L otti ▁of ▁An ella , ▁who ▁claimed ▁it ▁had ▁been ▁made ▁from ▁Peg ol otti ' s ▁original . ▁ ▁Peg ol otti ▁seems ▁to ▁have ▁had ▁access ▁to ▁an ▁earlier , ▁much ▁more ▁limited , ▁compilation ▁made ▁at ▁P isa ▁in ▁ 1 2 7 9 , ▁now ▁preserved ▁in ▁the ▁Bibli oteca ▁Comun ale ▁at ▁S ien a , ▁entitled ▁Mem oria ▁de ▁T uct e ▁le ▁Mer c ant ie . ▁ ▁Peg ol otti ' s ▁work ▁was ▁probably ▁used ▁by ▁the ▁compiler ▁of ▁the ▁Ven et ian ▁trade ▁manual ▁Tar ifa ▁zo è ▁not icia ▁dy ▁p ex i ▁e ▁mex ure ▁di ▁lu og i ▁e ▁t ere ▁che ▁s ' ad ov ra ▁marc ad ant ia ▁per ▁el ▁mondo ▁in ▁the ▁ 1 3 4 0 s . ▁It ▁then ▁served ▁as ▁a ▁source ▁for ▁a ▁later ▁work ▁which ▁shares ▁its ▁title , ▁the ▁Pr atica ▁della ▁merc atura ▁compiled ▁by ▁Giovanni ▁di ▁Bern ardo ▁da ▁U zz ano ▁in ▁ 1 4 4 2 . ▁So on ▁afterwards ▁it ▁was ▁drawn ▁on ▁by ▁the ▁author ▁of ▁Lib ro ▁che ▁tract a ▁di ▁mer cat ant ie ▁et ▁us anze ▁de ' ▁pa esi , ▁compiled ▁in ▁ 1 4 5 8 ▁probably ▁by ▁Giorg io ▁Ch iar ini , ▁afterwards ▁incorpor ated ▁in ▁Lu ca ▁Pa ci oli ' s ▁Sum ma ▁de ▁ar ithmet ica . ▁ ▁Cont ents ▁ ▁G loss