English: This is the "Roede der aarde met zyne ballen" page 245 of the book Geneeskundige Waarnemingen, the 1740 version of Observationes Medicae from 1641, translated into Dutch from the Latin original and embellished by Ludovicus Wolzogen. The book contains translations of medical notes by Tulp, but has some extra additions and plates. This plate was added as the 54th chapter, but did not exist in the earlier Latin version. This book was published a century later than the original, and both were quite popular.