On the top of the Merû (vertebral column), concealed in a hole, is the Somarasa (nectar of Chandra); the wise, whose intellect is not overpowered by Raja and Tama guṇas, but in whom Satwa guṇa is predominant, say there is the (universal spirit) âtma in it. It is the source of the down-going Idâ, Pingalâ and Suṣumnâ Nâdis, which are the Ganges, the Yamuna and the Sarasvati. From that Chandra is shed the essence of the body which causes death of men. It should, therefore, be stopped from shedding. This (Khechari Mudrâ) is a very good instrument for this purpose. There is no other means of achieving this end.