ways of practice were suggested. Some say that the three Channels all end at the place four fingers' distance below the navel. Some say that the Right and Left Channels do not end there, but extend down to the end of the precious organ. In the upper part, some claim, the Central Channel extends up to Smin-mds'ams, the center of the two eyebrows, and the Right and Left Channels extend down to the nostrils. Through correct practice, the Right and Left Channels which encircle the Central Channels in the center of the four chakras will eventually be straightened. As for the diameter of the Channels, there are no definite rules. Meditate on various diameters. When the Dumo is meditated upon, the color of the Central Channel should be visualized as the color of the oil lamps' flame. This whisper-given pith-instruction is found in the Tantras of Mkaspyol; however, before reaching this stage, the color of the Right Channel should be visualized as red, and the Left Channel as white, and the Central as blue.

Then the four Chakras should be meditated upon. First the Transformation Chakra of the Navel Center: its outer shape is triangular and has forty-two red nerve-leaves (Rts'adabs) extending upwards. This is a general way of meditating on these nerve-leaves. Though it is not specific, it is quite sufficient to serve the purpose. Second, the Dharma Chakra in the Heart Center; its outer shape is round, like the shape of the Bom word. It has eight white nerve-leaves extending downward. Third in the Throat Center lies the Chakra of Reward. Its outer shape is rounded like the Bom word. It has sixteen red nerve-leaves extending downward. The Yogi should understand that the last two Chakras symbolize Wisdom and Skill, and duly meditate upon them.

At the beginning of visualizing the three Channels, one should know that the process of visualization consists of two practices:

1. Seeing the Channels vividly, or forming a clear picture in the mind.

2. Holding on to this picture.

The mind should concentrate in the Central Channel at the point where the three channels join. This is very important. Then, one should proceed to visualize all the nerve-leaves, complete in number, of the different Chakras. Keep on with this practice; the nerve-leaves will become clearer and clearer in the mental picture.