PREFACE.
CHAPTER I. LOST IN THE SNOW.
CHAPTER II. FLYING.
CHAPTER III. VALVE MAKING.
CHAPTER IV. EXPERIMENTS.
CHAPTER V. PRESSURE.
CHAPTER VI. BALLOONING.
CHAPTER VII. PHILOSOPHICAL DISCUSSION.
CHAPTER VIII. TASKS.
CHAPTER IX. BURNING.
CHAPTER X. GRAVITATION.
CHAPTER XI. AIR IN MOTION.
CHAPTER XII. AIR AT REST.
