The Parva Naturalia ("Small Treatises on Nature") consists of the following seven works: On Sense and the Sensible , On Memory and Reminiscence , On Sleep and Sleeplessness , On Dreams , On Prophesying by Dreams , On Longevity and Shortness of Life , and On Youth and Old Age, On Life and Death, On Breathing . Etexts and printed texts linked on this page contain the entire collection.