What is said about the young coloured educated boy?

From the text:

The details of Mr. Washington's early life, as frankly set down in "Up from Slavery," do not give quite a whole view of his education. He had the training that a coloured youth receives at Hampton, which, indeed, the autobiography does explain. But the reader does not get his intellectual pedigree, for Mr. Washington himself, perhaps, does not as clearly understand it as another man might. The truth is he had a training during the most impressionable period of his life that was very extraordinary, such a training as few men of his generation have had.