In the Abhidharma texts, that flowers perfume sesame is used as a simile describing the mechanism of perfuming (_vāsanā_/_paribhāvanā_) in the context of meditative cultivation. According to the Sarvāstivādins, the meditative perfuming requires the co-existence of the perfumer and the perfumed. In comparison, the Yogācāra-vijñānavādins employ the same simile to explain their doctrine of the perfuming of all _dharma_s in _ālayavijñāna_, which demands the _bīja_ as the perfumed and the manifested _dharma_s as the perfumer to be simultaneous. My hypothesis is (...) that the Yogācāra idea of the perfuming of all _dharma_s is derived from the Abhidharma doctrine of meditative perfuming through the Sautrāntika theory of perfuming in non-concentrated (_asamāhita_) state. The idea of equating _vāsanā_ and _bīja_ probably took place under the doctrine of successive causality during the sectarian communication among the Sarvāstivādins, the Dārṣṭāntika-Sautrāntikas, and the early Mahāyānists. The Vaibhāṣika principle of simultaneous perfuming, which requires that the perfumed must co-exist with the perfumer, makes it possible in the Yogācāra-vijñānavāda that a _bīja_ in _ālayavijñāna_ is simultaneous with its manifestation. (shrink)