1 But let that man with better sense advise
advise > consider
2 That of the world least part to us is read:
least > [the least] read > discerned; known
3 And daily how through hardy enterprise 4 Many great regions are discovered, 5 Which to late age were never mentioned.
to late age > [to those living in recent times]
6 Who ever heard of the Indian Peru?
Indian > (America was thought to be India)
7 Or who in venturous vessel measured
venturous > bold, daring; adventurous measured > measured; traversed