He referred to black people as the "savage" or "inferior" races. He knew he was wrong, because people were into egalitarianism even in his days. It was only white supremacists who could not accept that all races are equal, he believed he had some magical powers for being white. Does that sound familiar? Because it certainly does to me.
And, he was wrong. PoCs are still here, and they're here to stay, whether you like it or not =]
He was correct at the time he wrote that. The majority of Africans were just savages, no signs of civilization ever found among them. That explain how the Egyptians where able to survive for 3000 years: endless supply of salves captured from the savages tribes of Africa. Yet, even after Egypt civilization, the Africans were not able to do anything more than build huts. So Darwin was historical correct, the Africans at that time were savages. It was Aryans which provided every technology the Africans use today. They are inferior when the comparison is technological progress and human intelligence.