Hello,

R N Gilchrist or Robert Niven Gilchrist has written many books on Political Science.

Different scholars have different aspects of seeing a theory or subject. So, they define them differently.

RN Gilchrist defines political science as "Political Science deals with the general problems of the state and organization of the government" He states that Political Science is a study of state and government.

Other scholars and philosophers define it in different manner. For example Paul Janet defined it as "Political Science is that part of social science which treats of the foundations of the state and principles of government." Similarly, RG Gettell defined it as "a historical investigation of what the state have been, an analytical study of what the state is and a politico-ethical discussion of what the state should be."

Hope it helps.

All The Best!!