Srotra akasayoh sambandha samyamat divyam srotram
This is the forty-second yogic sutra, which is contained in the third phase of the Patanjali Yoga Sutras.
The forty-second yoga sutra explains the further conquest of a yogi in the field of air. He is able to hear far-off sounds, which can be established by sarhyama between space and sound.
srotra of hearing
akasayoh in space, ether
samyamat by performing constraint
srotram power of hearing
By sarhyama on the relation between space and sound, the yogi acquires the power of hearing distant and divine sounds. The organ of hearing, the ear, grasps sound in space. This is the conquest of air