Bhṛgu–Bharadvāja-saṃvāda: Vānaprastha-parivrājaka-ācāra, Abhaya-dharma, and Lokānāṃ Vibhāga (Śānti-parva 185)
अद्रवत्वादनग्नित्वादभूमित्वादवायुत: । आकाश स्याप्रमेयत्वाद् वृक्षाणां नास्ति भौतिकम्,उनमें न तो द्रवत्व देखा जाता है, न अग्निका अंश, न पृथ्वी और वायुका ही भाग उपलब्ध होता है। आकाश तो अप्रमेय है; अतः वह भी वृक्षोंमें नहीं है, इसलिये वृक्षोंकी पाज्वभौतिकता नहीं सिद्ध होती है
adravatvād anagnitvād abhūmitvād avāyutaḥ | ākāśasyāprameyatvād vṛkṣāṇāṃ nāsti bhautikam ||
Bharadvāja said: “Because trees show no liquidity, no fiery element, no share of earth, and no presence of wind—and because space is immeasurable and thus cannot be established within them—the claim that trees are constituted of the gross elements cannot be proved.”
भरद्वाज उवाच
The verse argues from observable properties and knowability: if the usual marks of the gross elements (liquidity, heat/fire, earthiness, motion/air) are not evident in trees, and if space is not measurable in them, then one cannot straightforwardly establish that trees are materially constituted by the gross elements. It highlights limits of inference when empirical indicators are absent.
In a philosophical exchange in Śānti Parva, Bharadvāja presents a reasoned objection: he challenges a material-elemental account of trees by listing the absence of perceptible signs of the elements and by invoking the immeasurability of ākāśa, concluding that the trees’ gross-material constitution is not demonstrable on those grounds.