Commenting on this passage Sankarâcharya says: "Life is also called Angirasa, the essence of causes and effects. Angirasa is a compound of Anga and Râsa — Anga meaning members, causes, and effects, and Râsa essence, substance; the whole meaning therefore is the substance, upon which causes and effects depend — It is the essence of every thing, because unless it were present, all would become without effect." "He who abides in the mouth is Angirasa, for he is the essence (Râsa) of the members (Anga). Life is the essence of the members. This is also Brihaspati. Speech is Brihati. Life is the preserver (_pati_) of Brihati, therefore it is Brihaspati." B.A. I-3-19 and 20. Brihaspati or the presiding deity of the planet Jupiter is called Angirasa _i.e._ the son of Angiras. The wife of Angiras is, according to the Bhâgavata, Sraddha or Faith, and, according to Vishnu Purina, Smriti or Memory. The latter is a more suggestive name. Brihaspati or Jupiter is the essence of all beings and of the Universe and is connected with the memory of the past. Angirasa is the Rishi of the 5th Mandala of the Rig Veda. The Mantras of that Mandala are composed in the Brihati or big Metre. This accounts for the name Brihaspati (Brihati+pati). Brihaspati or Jupiter, as the guide of the Devas, has to play a most important part in bringing about the life evolution of the present Kalpa according to the records of the past and the essence or Râsa of all beings. The Âranyaka therefore calls him life itself. Utathya, another son of Angiras, is _u+tathya_. _U_ is an interjection, used as an expletive — _Tathya_ means reality, truth — Utathya is said to be an incarnation of Vishnu. Both the brothers are said to have distinguished themselves in the Second Manvantarâ. _Sinivâli_ is the day preceding that of new moon or that day on which the moon rises with a scarcely visible crescent. Kuhâ is new moon day when the moon is altogether invisible. _Râkâ_ is the full moon day. _Anumati_ is the 15th day of the moon’s age on which she rises one digit less than full. The full moon and new moon days have thus a mysterious connection with the essence of all beings. On those days the herbs have their medicinal properties in full and even men have mysterious potencies, which have formed the subject of occult study. TABLE F. Pulastya = Pula + Stya. _Pula_ is large, wide. It also means a thrill of joy or fear. _Stya_ is he who collects, is connected with, remains in. Agastya = Aga + Stya. _Aga_ is mountain, unable to walk, fixed.