This first of the six Enneads (ΕΝΝΕΑΔΕΣ) written by Plotinus (ΠΛΩΤΙΝΟΣ); arranged by Porphyry (ΠΟΡΦΥΡΙΟΣ) and translated by Kenneth Sylvan Guthrie contains the following nine books:
The Organism and the Self
Concerning Virtue
Of Dialectic, or the Means of Raising the Soul to the Intelligible World
Whether Animals May Be Termed Happy
Does Happiness Increase With Time?
Of Beauty
Of the First Good, and of the Other Goods
Of the Nature and Origin of Evils
Of Suicide
Photograph: Girl standing near tree by Kusakabe Kimbei (Japan, 1870s - 1890s). Scanned by the J. Paul Getty Museum.