The process of merging the prana of the being into Brahma prana is accomplished by the Nadies therefore it is essential to have knowledge regarding the Nadies. There are seventy thousand nadies and these influence the yogic points and chakras individually and collectively. The knowledge regarding all these Nadies cannot be completely obtained even in many births. Here we will describe Nadies which carry the flow of Prana towards Brahamanda and it is given below :
1. Ida. 2. Pingla 3. Sushumna :

i) Sushumna ii)Vajra iii) Chitrini iv) Brahma Nadi.

The seventy thousand nadies of the body gather their flow of prana from different parts of the body and meet Sushumna at different places. Few of their activities are increasing strength, increasing Knowledge, bestower of light nectar and the knowledge regarding Brahman. These are activated by satwik actions and they are a pointer to the Satwik modifications of mind. These are in constant struggle with the inspire the being to perform similar activities. Contemplation may result in bondage or emancipation, therefore emancipation depends upon one's own will. Before one acquires the knowledge of nadies it is essential to know the following :-
1. To activate the five tatwas.
2. The knowledge of Ida and Pingla before the knowledge of sushumna.
3. Observance of celibacy.
4. Satwik food : The food is absorbed in the body and produces atoms according to its own attributes. These atoms mix up with the atoms of prana and produce the results. The Satwik food also should be eaten in small quantities so that pranayam practices can be carried out nicely and at the same time body should not become weak in any way.
5. Keep the modification of the mind pure.
6. Maturity of Meditation
7. Perfection of tankore by mental Yoga. The nadies are present every where in the physical body. By the practices of Tankore, on the physical nadies the subtle Nadies become active.

The subtle nadies become very fine and it become difficult to recognize them in thousand petalled lotus. Subtle Nadies are visualized by inner eyes. Ultra subtle nadies are visualized by divine eyes. The way the physical body embraces the subtle body, seed alphabets, and the divine powers the subtle ultra subtle are also hidden like wise. All these can be visualized by closely studying body. This is a fact.

Ida and Pingla Nadies :-
The place of nadies :- From the middle line of body towards the clavicle bone at a distance of two fingers and then two fingers above on both the sides are the points of lda and pingla. They are on the left and right sides of Sushumna respectively. These collect the prana from different sources of their respective sites and merge into the sushumna. These also protect Sushuman from un-called-for damages and maintain the balance of the flow of prana through it.

The practice of awakening the Nadies :
Pass out the Apana air completely and stand straight facing east. Breathe through both nostrils and fill in the abdomen, keep the hands close to the body, bloat the abdomen repeatedly by breathing in and out on the navel. Hold the breath, when there is full pressure on the navel then slight tension or pain will be felt on the above two points during holding the breath. It indicates the success of the practice. Keep on doing this practice for a few days in the standing posture and later on it can be done in the sitting posture.
The activated moon and sun nadies carry the particles of the tatwas along with the flow of prana. The air tatwa is related to moon nadi and Water tatwa is related to sun Nadi. When the sun nadi is active one visualizes the flow of water, clouds in the sky scattered clouds and heat, when the moon nadi is active one experience the flow of air, a sound of Sham, Sham, Sham and coolness. In the inner light ida is blue and Pingla is red in colour.

Merging Ida and Pingla into sushumna - First activate Ida and Pingla and then merge them into sushumna by the following practices. The vishuddhi chakra contains sixteen seed alphabets from A to Ah. By their ascending and descending order japa the prana of Ida and Pingla nadies merge into the prana of sushumna. The japa should be first from left and right i. e. ascending order and then again from left to right. This constitutes one japa and it should be done at least seven times. The posture should be easy and one should face either North or East. This japa is done only in external Khumbaka (Holding the breath) which means that the air should be exhaled fully with force and then the japa should be done. It quickly gives success. During the japa a flower of three petals becomes visible in the center of the eye brows. The seed alphabets must be pronounced correcty. This practice takes the sadhaka from external worship towards internal worship and is one of the basic practices of yoga.

The meeting points of Nadies : In Agnya chakra both the nadies meet the sushumna nadi, this point is called Triveni of tri-point. It is first seen as green or yellow and gradually change into white. The following practice should be carried out to clarify this point :-
Sit straight facing East. Activate the sun and moon nadies. Collect prana at the navel, press the abdomen and direct the prana to the center of the brows. Drink nectar and apply gentle pressure on the eye lids. Do not flex the neck. The visualization is directly proportional to the force of the prana. The green and blue colours disapper and the above shape in white colour becomes clear. This is the point for the entry into Antaha-karana hence it is also termed Mooladhara or the main gate.

Sushumna Nadi : It arouses from Mooladhara and upwards and changes its shape in the thousand petalled lotus. It contains vajra, chitrini and Brahma Nadies. The Brahma Nadi arises and is activated from the great toe of the foot. On reaching the Mooladhara. Vajra chitrini and sushumna cover it respectively, therefore this nadi carries pure flow of prana only.
The activation of Brahma nadi and the flow of prana into it is the main aim of Yoga. Brahma nadi helps in the realization of Brahma. Sushumna along with its collateral nadias is responsible for transmitting the prana through out the body. This prana is directed to vajra which in turn gives it to Chitrini and finally the pure prana enters into the Brahma nadi which finally reaches Brahmanda, and this results in the unison of the external body with the Antahakarana and results in the elimination of individuality. According to laws of nature, the impure prana cannot enter sushumna for the opening of sushumna depends upon the master's Grace and the divine will. This point is in Agnya Chakra hence it is called the seat of the master. After mastering the practice of Pranayam the flow of prana can be directed through sushumna into Mooladhara. Swadhishthana, Manipoora, Anahat. Vishuddhi and Agnaya Chakra. It needs hard practices. Sushumna, Vajra, Chitrini and Brahma Nadi meet at the back of the neck. During pranayam it is therefore ordained to flex the neck and place the chin on the chest so that pressure may be directed on these spots and they may be activated. In the neck the sushumna is bent, Ida and pingla are towards the shoulders in the chest region and vajra, Chitrini and Brahma Nadi join each other at a distance of one finger each from below upwards.

Awakening the places :
i) Stand facing East and by applying pressure on the navel bloat the abdomen and flex the neck so that the chin touches the chest At this time the points which reveal tension must be kept in mind. These three points are the meeting points of Vajra, Chitrini and Brahma Nadi. First is the meeting point of Sushumna and Vajra and second is the meeting point of Vajra and chitrini and third is the meeting point of chitrini and Brahma Nadi. In the end only Brahm Nadi remains but usually it is termed sushumna.
ii) Forcefully breathing in are out directing the pressure over the navel center sushumna is activated. It happens when the tankore acts on Manipoora. Sushumna can also be activated in movements of arms and legs are performed in the manner of an infant. This is called Bal-Hath Yoga Posture.
iii) Press the abdominal wall till it touches the spine. This should be done during poorak, kumbhak, and Rechaka. Pooraka is done by Ida, Kumbhaka in sushumna and rechaka by pingla.
iv) Sit it an easy posture, relax the whole body and inhale and exhale, without noise. See with help of the inner eyes, the extent to which the prana travels. Practice to direct prana upto Moolcdhars. In a few days the Mooladhara becomes clearly visible. If the earth tatwa is activated after visualising mooladhara then the sushumna's opening appears as a black dot.
v) Sit in an easy posture, develop prana at the navel and establish them in the Agnya Chakra, drink nectar, flex the neck forwards. Hold the breath and apply pressure on the closed eyes. While deciding about the Ida and pingla Nadies concentrate on their middle point. This is the opening of Brahma Nadi hence there are only two suitable points for the entry of Prana. For sushumna it is mooladhar and for Brahma Nadi it is Agnya Chakra it should be done by the following practices.

Entry of prana into mooladharb : First activate the earth tatwa and then by mental contemplation direct the prana to mooladhar. The prana revolves round the opening of Sushumna but is unable to enter it because the opening of sushumna does not appear steady. It means, when the chita is steady, the opening of sushumna also appears steady otherwise not. The steady chita is achieved when the modifications of the chita become satwik. This is the real utilization of the practices of the control of modifications of chita. When the opening is visualized in the mooladhara, then the japa of Aum should be performed and nectar should be drunk. By the tankore of the prana on the closed orifice of sushumna, the closed mouth of Sushumna opens up and then the black point is visualized in white colour, radiant like Sun. This is an indication of the prana entering the Sushumna and denotes the success of the practice.

Entry into Agnya Chakra
First visualize the Agnya Chakra and direct the prana into it. Perform the practice of Nectar drinking and do the japa of AUM. Listen to SOHAM or Anhat Nada. The neck should be flexed forward and slight pressure should be applied on the closed eyes with fingers. The subtle body should be directed on to the central luminous point of Agnya Chakra. Wait for the BRAHMA Nadi to open its mouth. As soon as it opens direct the prana and the subtle body into it. The orifice of sushumna and BRAHMA Nadi keeps on opening from time at intervals of few minutes by the order of the Master. When the sound of Thunder of the clouds is perceptible in the Anahata Nadi be careful the orifice is about to open and be ready. As soon as the orifice open and Electric light in the form of a ray of light appears coming from Brahmnada towards Antahakarana. It is exactly like the electric thunder in the clouds. As soon as this electric light is visible entry should be made into the orifice without any delay. Do not forget to pay obeisance to the Master during this practice.
The orifice of the BRAHMANADI can only be recognized by the subtle body. If one is not successful he should give the Tankore of Vam, sham seed alphabets. Brahma Nadi Chitrini and Vakra Nadies are Brahmani, Saraswati and Gayatri Devis or the Trifaced Devis. This practice bestows equipoise.

Symptoms of the flow of prana into sushumnab :
When the manas and prana start flowing through the sushumna the Antahakaran experiences peace. The Manas and prana start experiencing the witness form of god and become one with it. Aum is Visualized. The seven chakras and seven lokas start appearing. The subtle body starts working according to the direction given to it and the Manas is happy. The vision in Antahkarana is as if you are seeing in a mirror. Consciousness is awakened and one attains the par-excellent state of Kaivalya. All the charkas and spheres of existence can be seen in the universal existence. The yogi remains cheerful and his soul is quiet and experiences coolness. The curse of darkness disappears. He is blessed by god with every thing just as an obedient child gets from his mother. God (the mother) also bestows everything to the yogi with pleasure.
The flow of prana in sushumna gives rise to various visions of clear sky, white light, animals and birds and various Devas and Devis. It is a cool light hence provides bliss. When the prana flows into vajra the quantum of light increases. The divine flame BRAHMAJYOTI and various other bright flames become visible. In the light generated by the flow of prana in chitrini various seed letters become visible easily without effort. The light of BRAHMANADI is like that of millions of suns and no figure is visible here. When one visualizes sushumna from Mooladhara to Agnya Chakra it is something like this : 4 the points where sushumna vajra chitrini and BRAHMANADIES meet in the nape area, it is some what like this : Figure 5. visible in the from of a counch : Figure 6. The vision at agnya Chakra while entering Sushumna is as follows : Figure 7. In the (Shatkone) Hexagone. Sushumna vajra, Chitra. Brahmanadi : Figure 8.
The (shat kone) Hexagon merges into the six chakras and the external chakras start becoming visible in the Antahakarna. Millions of Nadies carry the prana throughout the body, few of them merge into ida and pingla and some straight away merge into Sushumna. Ida and pingla also merge into sushumna in the end. When the pressure of prana increases in sushumna then it transmits the pressure towards the vajra and when the pressure in the vajra become more and it is unable to bear it, the prana enters chitrini and in the end chitrini is also not to cope with the increased pressure of prana and they find their path into the Brahma Nadi.
The pressure of prana by tankore is responsible for their access to Brahmandi therefore the entry of prana into sushumna, chitra, vajra and its expanse in Brahma Nadi depends upon the pressure of prana and exactly like filling the air by pressure through a small whole into the tube. It is therefore necessary to have an adequate store house of prana so that tankore may be successful. The presence of prana is responsible for the brilliant manifestation of two seed alphabets on either side of Agnya chakra and keep on shining till the pressure becomes less. It is natural that this practice can only be carried out during the process of Kumbhaka that is holding of the breath.

Aum Shantih Aum Shantih Aum Shantih
Yogi Raj The Master Bharatari Hari.