The lowly type of Pranayama is Manda and the duration (of retention of breath) is twelve Matras; the middl¬ ing is of the duration of twenty-four Matras while the last type of restraint of Prana is of thirtysix Matras. In these three types, perspiration, shivering and gasping are generated in due order. This is the most excellent of the Yogas to even ordinary men due to bliss) [v. 1. The excellence of these should be judged by the bliss caused thereby].