To the Nile: To the Nile

SON of the old moon-mountains African!
Chief of the Pyramid and Crocodile!
We call thee fruitful, and, that very while,
A desert fills our seeing's inward span;
Nurse of swart nations since the world began,
Art thou so fruitful? or dost thou beguile
Such men to honour thee, who, worn with toil,
Rest for a space 'twixt Cairo and Decan?
O may dark fancies err! they surely do;
'Tis ignorance that makes a barren waste
Of all beyond itself, thou dost bedew
Green rushes like our rivers, and dost taste
The pleasant sun-rise, green isles hast thou too,
And to the sea as happily dost haste.