Nowhere close to the first published text on conjuring. Scot is notable for being the earliest detailed describer of sleight of hand with playing cards, and for being in English. However, much earlier sources pertaining to both card sleights and various other forms of conjuring in other languages are known.
Bill Kalush wrote an entire paper titled, Sleight of Hand With Playing Cards Prior To Scot's Discoverie. A copy of this paper can be found in Puzzler's Tribute: A Feast for the Mind by David Wolfe, Tom Rodgers, and Authur Clarke. The book is a collection of papers that were written for the Gathering for Gardner conventions in Atlanta. I recommend it.
Jason England