From the Souvenir Album of Lake County, 1906, found at the Lowell Public Library:
Dr. Frederic Castle is an old resident of Lowell. He has devoted fifty
years to the study of violin tone-problems -- the philosophy of violin
peculiarities, excellencies and defects. Violins come to him from
various parts of the country for test, valuation or reformation. His
interesting experiences and valuable conclusions to violin students, as
to production, modification and preservation of violin tones, are set
forth in his unique way of lectures to a mythical club, and published in
his book, Violin Tone Peculiarities, from which the doctor derives both
deserved reputation and revenue.
