Note 5 — INTRODUCTION.

Since the reading of this memoir at the Institute, M. Correa da Serra, to whom I had previously read it, has had the goodness to inform me of some researches which he has made upon this subject. He discovered that Don Miguel de Sylva left the kingdom of Portugal in 1542, that he only arrived in Italy in 1543 to receive the cardinal’s hat, and he thinks that he could only have reached that country by passing through France, where he had formerly studied, and that he doubtless there left the originals from which our charts were copied.