The next day (September 17) the currents became favourable, and the weeds still floated about them. The variation of the needle now became so great that the seamen were dismayed, as the journal says, and the observation being repeated Columbus practised another deceit and made it appear that there had been really no variation, but only a shifting of the polar star! The weeds were now judged to be river weeds, and a live crab was found among them,--a sure sign of near land, as Columbus believed, or affected to believe. They killed a tunny and saw others. They again observed a water wagtail, "which does not sleep at sea." Each ship pushed on for the advance, for it was thought the goal was near. The next day the _Pinta_ shot ahead and saw great flocks of birds towards the west. Columbus conceived that the sea was growing, fresher. Heavy clouds hung on the northern horizon, a sure sign of land, it was supposed. On the next day two pelicans came on board, and Columbus records that these birds are not accustomed to go twenty leagues from land. So he sounded with a line of two hundred fathoms to be sure he was not approaching land; but no bottom was found. A drizzling rain also betokened land, which they could not stop to find, but would search for on their return, as the journal says. The pilots now compared their reckonings. Columbus said they were 400 leagues, while the _Pinta's_ record showed 420, and the _Nina's_ 440. On September 20 other pelicans came on board; and the ships were again among the weeds. Columbus was determined to ascertain if these indicated shoal water and sounded, but could not reach bottom. The men caught a bird with feet like a gull; but they were convinced it was a river bird. Then singing land birds, as was fancied, hovered about as it darkened, but they disappeared before morning. Then a pelican was observed flying to the southwest, and as "these birds sleep on shore, and go to sea in the morning," the men encouraged themselves with the belief that they could not be far from land. The next day a whale could be but another indication of land; and the weeds covered the sea all about. On Saturday, they steered west by northwest, and got clear of the weeds. This change of course so far to the north, which had begun on the previous day, was occasioned by a head wind, and Columbus says he welcomed it, because it had the effect of convincing the sailors that westerly winds to return by were not impossible. On Sunday (September 23), they found the wind still varying; but they made more westering than before,--weeds, crabs, and birds still about them. Now there was smooth water, which again depressed the seamen; then the sea arose, mysteriously, for there was no wind to cause it. They still kept their course westerly and continued it till the night of September 25.