[2] He was an untiring author and editor, and acquired the highest reputation as a teacher, and for his scholarship, science, and particularly for his great bibliographical knowledge.
For this specialty, it has been suggested, he may have been indebted to the opportunities of observation afforded him by his uncle Jan Jansson, the printer, whose name he bore.
Besides editions with notes of Strabo, Juvenal, Quintilian, the Aphorisms of Hippocrates, Celsus, Apicius, Aurelian on Diseases, and Decker's Treatise on Supposititious Writings, he has left a work in Dutch on the anatomy of the muscles, several bibliographical treatises in Latin, among which are a work—De Vitis Stephanorum, a list of Plagiaries, and a list of books promised that never appeared.
[2] In his Inventa nov-antiqua (1684), he discusses in detail, with a strong bias towards antiquity, the question of how far the discoveries in contemporary medicine were anticipated by ancient physicians.
His list includes Andrea Alciato, Bodin, Calvin, Casaubon, Heinsius, Junius, Justus Lipsius, Petrus Ramus, Claudius Salmasius, Scaliger, and Henry Estienne, among others.