On occasions when he was fairly puzzled, and the teacher would put the question to a boy lower in the class, the latter would tremble and stammer, and look now at his teacher, and now squint at Peter, stammer again, and again look from the one to the other, while Peter would draw his book before his face, and, giving a scowling glent at the stammerer, would give a sort of significant nod to his fist suddenly clenched upon the open page; and when the teacher stamped his foot, and cried, "Speak, sir!"
"Wilson's Tales of the Borders and of Scotland, Vol. XX"
Alexander Leighton
The next two brothers, having more or less the same gifts, followed the eldest to New York; the next, an incurable stammerer, was disqualified for the pulpit, and studied medicine, being moreover of a fragile constitution; and the next, having the least possible sympathy for the calling, also took to medicine.
"The Autobiography of a Journalist, Volume I"
William James Stillman
For instance, the stammerer might be asked to picture himself speaking easily to people, and feeling perfectly at ease.
"A Practical Guide to Self-Hypnosis"
Melvin Powers