Of the time consumed by this puzzled memory and reflection, Campbell could form no estimate. Everything about his state was so unreal that ordinary dimensions and measurements became meaningless. It seemed an eternity, but perhaps it was not really long before the sudden interruption came. What happened was as strange and inexplicable as the blackness it succeeded. There was a sensation - of the mind rather than of the body -- and all at once Campbell felt his thoughts swept or sucked beyond his control in tumultuous and chaotic fashion.