There is the little shop in a steep Lisbon street, somewhere near the harbour we may be sure, with the shadows of the houses lying sharp on the white sunlight of the street; the cool darkness of the shop, with its odour of vellum and parchment, its rolls of maps and charts; and somewhere near by the sounds and commotion of the wharves and the shipping.

Often, when there was a purchaser in the shop, there would be talk of the sea, of the best course from this place to that, of the entrance to this harbour and the other; talk of the western islands too, of the western ocean, of the new astrolabe which the German Muller of Konigsberg, or Regiomontanus, as they called him in Portugal, had modified and improved.

And if there was sometimes an evening walk, it would surely be towards the coast or on a hill above the harbour, with a view of the sun being quenched in the sea and travelling down into the unknown, uncharted West..