The bird which produces the guano is a sort of tern, with red bill and legs.  It has a long whisker-like feather curling out under the ear on each side.  The top of the head and the tips of the wings and tail are black.  The body, which is about ten inches long, is of a dark-slate colour.  Large flocks of gulls, divers, and pelicans, likewise visit the islands.  It is calculated that, on one island alone, there were 2,000,000 tons of guano; and although from 200,000 to 300,000 tons are annually imported into England, it will take some time to exhaust the supply.  Guano is a corruption of the Quichua word _huaim_.  The Quichua is the language of the Incas.  Under the enlightened government of the Incas the value of guano was well-known, and severe laws were enacted against any one disturbing the birds during the breeding season. Pulling away to another island, we found a number of Chinese employed in digging out the guano.  We were not surprised at seeing them look very miserable and unhappy, for the oppressive odour arising from the fresh-dug guano was intolerable, to us even for a short time.  We were told that many of them in their wretchedness commit suicide, flying, through their ignorance, from present evils to those they know not of, instead of endeavouring manfully to support their lot, if inevitable, or to seek proper means to escape from it if they have the power--not that I thought this at the time, by-the-by.  I only remarked to Jerry that they were very great fools for their pains.  A little way up the bay, on the mainland, is the sea-port of Pisco, a neat Spanish-built place.  In the neighbourhood are numerous remains, which prove how populous must have been the country under the sway of the Incas.