Nitāi: "Due to the interaction of water with the taste perception, the subtle element odor evolves under superior arrangement. Thence the earth and the olfactory sense, by which we can variously experience the aroma of the earth, become manifest."
Prabhupāda:
- rasa-mātrād vikurvāṇād
- ambhaso daiva-coditāt
- gandha-mātram abhūt tasmāt
- pṛthvī ghrāṇas tu gandhagaḥ
- (SB 3.26.44)
So further analytical study of water is mentioned here by Kapiladeva. So the rasa, taste. Taste changes into gandha, smell. So the taste is created by daiva-coditāt. Taste of everything... Everything is being done, daiva-coditāt, the beginning. But the taste creates the different kinds of fragrance, gandha, smell, within the earth. There is water, there is taste, and taste and formation—either you say chemical or physical changes—it becomes smell. So different kinds of smell there are already within the earth. Simply it brings out by different methods. The scientist does not know. That we have already explained several times, that the different gandha, or smell, or fragrance, or aroma, whatever you call, there are already within the earth. Puṇyo gandhaḥ pṛthivyāṁ ca. Kṛṣṇa says in the Bhagavad-gītā, puṇyo gandhaḥ and pāpo gandhaḥ. In the material world, everywhere, there are two things: pious and impious. So the pāpo gandhaḥ, bad smell, when it passes, so you close your nose, nostrils, not to accept it. But when there is puṇyo gandhaḥ, you feel fresh: "Oh, it is very nice."