 The modus sciencie, according to the prologue of his NLPery, “consists of the speculation about the proven properties of the parts and species of the subject matter” (Lewry Pery, 382; see also NLP prologue; LT 50, 125), which is done by means of definition, division, and collection. By means of division one comes to know the subject of a science; through collection or reasoning one comes to know the properties of the parts and species of the subject; from definition, one comes to know the parts and species of the subject (DOS 524–525; QLIS 7, 18–19).