I think this has been discussed in another thread. There are 4 etudes: Ile de Feu 1, mode de valeurs et d'intensité, neumes rythmiques, and Ile de Feu 2. They're studies in rythm, the way Messiaen conceived it. I only played the first and the last. REally exciting pieces. Dedicated to the Papaouise, I think. You can hear the jungle calling throughout. Now, if I were "retrouvailles" or "hztb", I'd simply say, "when in doubt, look it up. google it. useful stuff"
Sooner or later I'm going to get a scanner and learn how to use it...