"You must excuse me for taking your head off, but I shall have to do it in order to put your brains in their proper place." "That's all right," said the Scarecrow.

"You are quite welcome to take my head off, as long as it will be a better one when you put it on again." So the Wizard unfastened his head and emptied out the straw.

Then he entered the back room and took up a measure of bran, which he mixed with a great many pins and needles.

Having shaken them together thoroughly, he filled the top of the Scarecrow's head with the mixture and stuffed the rest of the space with straw, to hold it in place.
When he had fastened the Scarecrow's head on his body again he said to him, "Hereafter you will be a great man, for I have given you a lot of bran-new brains." The Scarecrow was both pleased and proud at the fulfillment of his greatest wish, and having thanked Oz warmly he went back to his friends.
Dorothy looked at him curiously.

His head was quite bulged out at the top with brains.
"How do you feel ?" she asked.
"I feel wise indeed," he answered earnestly.