We are familiar with the Category of Vaigesika. Vaigesika's atomic theory is known to all. Though, Vaigesika has been closely related with the Nyiya from a very ancient time, still, so far as the theory of knowledge is concerned, they do not perhaps follow. They had own epistemology. They admitted only two pramakias. There are some fundamental differences regarding the nature of perception and inference. This volume contains characteristic of valid and invalid knowledge in Vaigesika's perspective.