It does not concern us who first discovered them; they had doubtless been seen before, but Fabricius first recognized them as general structures in the venous system, and he called them little doors--"ostiola." The quadrangle of the university building at Padua is surrounded by beautiful arcades, the walls and ceilings of which are everywhere covered with the stemmata, or shields, of former students, many of them brilliantly painted.

Standing in the arcade on the side of the "quad" opposite the entrance, if one looks on the ceiling immediately above the capital of the second column to the left there is seen the stemma which appears as tailpiece to this chapter, put up by a young Englishman, William Harvey, who had been a student at Padua for four years.

He belonged to the "Natio Anglica," of which he was Conciliarius, and took his degree in 1602.

Doubtless he had repeatedly seen Fabricius demonstrate the valves of the veins, and he may indeed, as a senior student, have helped in making the very dissections from which the drawings were taken for Fabricius' work, "De Venarum Osteolis," 1603.
If one may judge from the character of the teacher's work the sort of instruction the student receives, Harvey must have had splendid training in anatomy.

While he was at Padua, the great work of Fabricius, "De Visione, Voce et Auditu" (1600) was published, then the "Tractatus de Oculo Visusque Organo" (1601), and in the last year of his residence Fabricius must have been busy with his studies on the valves of the veins and with his embryology, which appeared in 1604.