Franklin Merrell-Wolff continues this series by considering the Mano Kosha, or sense-mind, and the raja yoga of Patanjali that is related to it. He begins by issuing a word of warning concerning the attainment of phenomenal yogic powers and then proceeds to analyze the apparent power that the sense-mind sheath has over us. He makes a distinction between freeing oneself from bondage to the appearance of sensuous objects achieved through meditation, concentration, and sensory deprivation and the freedom from the sensible objects attained through the liberating power of pure mathematics. He go on to discuss the history of counting and the development of number theory far transcending the power of sensuous correlation to demonstrate how objects of conceptual thought may function as a yogic discipline to undercut our attachment to the world of sensible objects.