I found my copy of the page. We have: Horizontal Vrille, Retournment, Renversement and the notorious "Change of Direction" (two diagrams). I came across this years ago when I was researching a Nieuport 11 build, so I would bet it has something to do with the Escadrille Lafayette training; the aircraft is an early SPAD (and not the McDonald's hamburger box kind). ;-)

Originally published in the New York Evening World.