The history of philosophy aims to give a connected account of the different attempts which have been made to solve the problem of existence or to render intelligible to us our world of experience. It is the author of the development of reasoned human thought from its earliest beginnings down to the present time; not a mere chronological enumeration and exposition of philosophical theories, but a study of these in their relation to one another, the times in which they are produced, and the thinkers by whom they are offered. While every system of thought is more or less dependent on the civilization in which it arises, the character of preceding systems, and the personality of its author, it, in turn, exercise a potent influence on the conceptions and institutions of its own and succeeding ages. The history of philosophy must, therefore, endeavour to insert each world-view in its proper setting, to understand it as a part of an organic whole, to connect it with the intellectual, political, moral, social, and religious factors of its present, past, and future. It must also attempt to trace the line of progress in the history of human speculation: show how the mental attitude called philosophy arises, how the different problems and the solutions that are offered provoke new questions and answers, and what advance has been made, on the different stages, towards reaching the goal. Frank Thilly