Take a little child of about seven or eight years of age, especially one who has the marks of motor heredity, and observe the method of his acquisition of new words in reading.

First he speaks the word which his habit dictates, and, that being wrong, he rolls his eyes away from the text and makes a guess of the first word that comes into his mind; this he keeps up as long as the teacher persists in asking him to try again.

Here is the same tendency that carries him later on in his education to a general conclusion by a short cut.

He has not learned to interpret the data of a deliberate judgment, and his attention does not dwell on the necessary details.

So with him all through his training; he is always ready with a guess.