Commentaria in primam fen primi libri canonis Avicennae.

The chief value of this work is in its cautious revelation of the principles of construction of various instruments that Santorio had invented, including a hygrometer, a pendulum for measuring pulse rate, a syringe for extracting bladder stones, and a bathing bed. The instruments are depicted in woodcut diagrams, the earliest illustrations of Santorio’s instruments. For the first description of Santorio’s pulse-clock see No. 572.1.