In his auto-commentary on the first stanza of the second chapter of his Abhidharmakośabhāṣya 倶舍論, Vasubandhu 世親 gives the further example of the olfactory faculty 鼻根 as the dominant factor in olfactory perception, which, like the visual faculty, also serves an important role of guiding and nourishing the body. To illustrate this point, Vasubandhu turns to an example given in the *Mahāvibhāṣā 大毘婆沙論 (T 1545.27.731b1–2)—namely, the gandharvas 健達縛, who rely on their olfactory faculties to negotiate their way through the physical environment, as well as locate and absorb the scent-vapors 香氣 on which they subsist. Xuanzangʼs translation of the *Mahāvibhāṣā explains that three faculties—namely, the olfactory, gustatory 舌根, and tactile 身根—guide and nourish the body in enabling various types of sentient beings 衆生, including gandharvas, to intake and digest piecemeal food 段食, thus sustaining the nutritive capacities essential to their continued survival.