63 leaves, plus inserts. Text is unbound, composed in Latin, handwritten in pencil and black ink. Extensively paginated, with only one anomaly: there is both a page 31 and a page 31A (which features supplementary notes/diagrams). Title, "Theologia naturalis", is given in full on the initial leaf and in abbreviated form on each of the following leaves. There is also one inserted leaf from a completely different work, on the Eucharist, which is marked as page 53. A complete manuscript copy of this other treatise is present (with its own page 53) later in this collection. Finally, between pages 59 and 60 there is a loose sheet of stationery with the title "De methodo docendi et studendi", which looks like the beginning of its own separate work.