48.
For the effect of Magellan's voyages, and the reluctance to yield to proof, see Henri Martin, Histoire de France, vol.xiv, p.

395; St.
Martin's Histoire de la Geographie, p.

369; Peschel, Geschichte des Zeitalters der Entdeckungen, concluding chapters; and for an admirable summary, Draper, Hist.Int.Devel.of Europe, pp.

451-453; also an interesting passage in Sir Thomas Brown's Vulgar and Common Errors, Book I, chap.

vi; also a striking passage in Acosta, chap.ii.For general statement as to supplementary proof by measurement of degrees and by pendulum, see Somerville, Phys.Geog., chap.