Circulation of Prana 129 



division as the cerebrum (always recognized in 

 physiology as the dominant part of the brain), and 

 the lower, or negative, as the cerebellum. In the 

 heart, we can identify the auricles as the negative, 

 and the ventricles as the positive divisions. Notice 

 that in both centers the positive divisions are near- 

 est the poles of these centers; thus, the lower cham- 

 bers of the southern center are positive, and the 

 upper part of the brain; that is, the hemispheres 

 of the cerebrum. Put yourself in imagination 

 within your egg-shaped aura and this will be clear 

 to you. 



The eastern and western currents of Prana make 

 for themselves two main channels called respec- 

 tively Pin gala (the positive) and Ida (Ee-dah 

 the negative), which run down the length of the 

 spine forming the trunks of the great sympathetic 

 system. The spinal canal is the Sushumna, the 

 conjunction of the two currents where the Prana 

 changes from side to side. There is also a cardiac 

 Sushumna midway between the right and left lobes 

 of the heart. To all these conduits of force 

 nerves, arteries, and veins the Tantrists give the 

 name " Nadi," and for the sake of its simplicity 

 we will retain it. The three Nddis above men- 

 tioned are the most important in the body being 

 the great reservoirs and conduits of life- force. 



Radiating from both the Ida and the Pingala 

 are fifty principal Nddis, and these branch into 



