 The Manual of Reason’s remarks on the nature of space and time are sketchy in the extreme. We must supplement them with details from other Vaiśeṣika and Nyāya authors. Even then, the theories of space and time found in Nyāya-Vaiśeṣika texts have been studied very little, and we can only form a rough and inadequate picture at the present time. The Manual of Reason’s observations concerning the notion of space are as follows: