We have mentioned that Columbus kept a diary on this voyage. He was, in fact, a prodigious writer, having left behind him when he died a vast quantity of memoirs, letters, and even good verse; and besides these, maps and charts in great numbers. No matter how trying the day had been, with fractious crews and boisterous ocean, no matter how little sleep the anxious commander had had the night before, no matter how much the ill-smelling swinging lamp in his cabin rocked about, he never failed to write in his journal. This precious manuscript was long in the possession of Columbus's friend Bartolome de las Casas, who borrowed it because he was writing a history of Columbus and wished to get all the information, possible in the navigator's own words. Las Casas was a monk who spent his life in befriending the Indians. When quite old, he ceased journeying to the New World and stayed at home writing history. He copied a great deal of Columbus's diary word for word, and what he did not actually copy he put into other words. In this way, although the original log of the _Santa Maria_ no longer exists, its contents have been saved for us, and we know the daily happenings on that first trip across the Atlantic. Nearly every day some little phenomenon was observed which kept up the spirits of the crew. On September 13 one of them saw a bright-colored bird, and the sight encouraged everybody; for instead of thinking that it had flown unusually far out from its African home, they thought it belonged to the new land they were soon to see. Three days later they saw large patches of seaweed and judged they would soon see at least a tiny island. On the 18th the mended _Pinta_, which had run ahead of the other two boats, reported that a large flock of birds had flown past; next day two pelicans hovered around, and all the sailors declared that a pelican never flew more than sixty or seventy miles from home. On September 21 a whale was seen--"an indication of land," wrote the commander, "as whales always keep near the coast." The next day there was a strong head wind, and though it kept them back from the promised land, Columbus was glad it blew. "This head wind was very necessary for me," he wrote, "because the crew dreaded that they might never meet in these seas with a fair wind to drive them back to Spain." Soon they were passing through the Sargasso Sea (named from the Portuguese word meaning "floating seaweed"). Its thick masses of drifting vegetation reassured them, for the silly legend that it could surround and embed a ship had not then found believers. Many years after it was discovered that several undercurrents met there and died down, leaving all their seaweed to linger on the calm, currentless surface. But back in 1492 the thicker the seaweed, the surer were those sailors that it indicated land.