In fact, the title of Robert-Houdin's book is :
Les Secrets de la Prestidigitation et de la Magie,
Comment on devient sorcier
The Secrets of Conjuring & Magic; How to Become a Conjuror.
It was published first in 1868.
In it, Robert-Houdin described Conus' Aces under the title :
TOUR DES QUATRE AS.
In fact, it's a trick in three parts (Robert-Houdin wrote that he have seen it performed by his creator).
First, it's now the well known trick where the four Aces, placed together in the middle of the deck, came where the spectator want; two on top and bottom, or four on top or bottom, etc..
Second, it's the slow motion transformation.
Third, it's the multiplication of the Aces.
Ponsin, who was the first to describe the trick in 1854, described only the second and third part. He described the first part (without quote Conus)under the title :
"Faire changer 4 cartes, 2 fois de suite, de situation ds le jeu"
To Change the position of four cards in the deck two times.