Slevin's Mockingbird Whistles-- 25 cents and a stamp will procure one of the Only Original
Whistles. Something new; 3 for 50 cnts., 8 for $1; novel and amusing, that will enable any person
to imitate with the greatest accuracy the warbling and singing of birds and grunting of animals.
SLEVIN & CO.'S, 111 Nassau street, N.Y.
Frank Leslie's Illustrated Newspaper (New York, New York), September 14, 1867.