Arithmetica Universalis

Staffan Rodhe's office door was open today, I was passing by, so I dropped in. I was admiring the collection of ancient mathematical texts on his shelves. I first picked up a book by Lagrange, then one by Euler, and then the Arithmetica Universalis by Newton. I opened it somewhere in the middle and found a square piece of paper  (size around 10 cm) with some equations on one side and a couple of geometric drawings on the other. Clearly, it belonged to an careful reader of some past century. Most likely, Staffan explained, it was written some time in the 18th c. I took a couple of photos of both sides, as well as a copy of the title page of the book because they are, in my opinion, like pieces of art. It also makes me wonder how people thought back then, how similar to us they were, etc. Note that this edition of Arithmetica Universalis was published in 1732 in Lugdunum Batavorum, i.e., Leiden. There is a free version on the internet from a 1752 copy from Amstelodamum (Amsterdam). The original edition dates from 1707.