Brussel, Koninklijke Academie voor Wetenschappen, Letteren en Schone Kunsten van België, ( treatise of the Royal Belgian Acadamy ) , 1998, in-8°, 26 x 18 cm, 266 pp , index, bibliography, sewn, original stiff wrapper, published as treatise no. 162 of the Royal Academy. Text in Dutch, with a short summary in English. Boek in het Nederlands. The Latin text with a translation into Dutch of Lessius' ideas on intrest, loans and usury as expressed in his book '' De iustitia et jure '' , with commentary.