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PRANAYAMA753. Yoga NadisNadis are the astral tubes made up of astral matter thatcarry the subtle Prana. lt is through these Nadis that the vitalforce of Pranic current moves. Since these are made up of subtlematter, these cannot be seen by the naked eyes. TheseYoga Nadis are not ordinary nerves, arteries and veins that areknown to Vaidya Sastra. The body is filled with innumerablenumber of Nadis that cannot be counted. Nadis play a vital partin this Yoga. These subtle tubes-Yoga Nadis-have influencein the physica! body.4. ChakrasWherever there is an interlacing of several nerves, arteriesand veins, that centre is called as "Plexus." Similarly thereare plexuses or centres of vital forces in the Sukshma Nadis.These are called as Chakras or Padmas. All Nadis spring fromKanda. lt is in the junction where the Sushumna Nadi is connectedwith the Muladhara Chakra. Of the innumerable Nadis,lda, Pingala and Sushumna are the most important. lda andPingala Nadis are on the two sides of the spinal cord andSushumna is within the spinal cord. lda operates through theleft nostril and Pingala through the right nostril. When thebreath operates through Sushumna, the mind becomes steady.This steadiness of mind is termed "UnmaniAvastha," the higheststate in Raja Yoga. lf you sitfor meditation when Sushumnais operating, you will have wonderful meditation. When theNadis are full of impurities, the breath cannot pass through themiddle Nadi. So, one should practise Pranayama for the purificationof Nadis.5. Prana and MindThe mind of a man can be made to transcend ordinary experienceand exist on a plane higher than that of reason knownas superconscious state of concentration and gets beyond thelimit of concentration. He comes face to face with facts whichordinary consciousness cannot comprehend. This ought to beachieved by proper training and manipulation of the subfleforces of the body, so as to cause them to give an upward pushto the mind in the higher regions. When the mind is so raised