Gray, Thomas  Charles Glicksberg relays Walt Whitman’s description of Thomas Gray as one of the "odd characters" at Pfaff’s--a "good looking young Scotchman elegantly dress’d - [who] does the tricks, cutting his fingers &c - at Pfaff’s and Faffleys May, June, July, 1862" (275).

References & Biographical Resources

Glicksberg, Charles I. "Walt Whitman in 1862." American Literature. 1934. 264-282. 
Quotes Whitman describing him as one of the "odd characters" at Pfaff's, a "good looking young Scotchman elegantly dress'd - does the tricks, cutting his fingers &c - at Pfaff's and Faffleys May, June, July, 1862."
 [pages:275]