While intellectual history is a bird’s eye view of the intellectual landscape, a history of philosophy is a x-ray version of that landscape. A Gothic church has her beautiful stained glass windows, paintings and all other exquisite adornments but they merely suggest or altogether fail to tell us the underlying structure that supports the church itself. The relation between ideas and philosophy is similar. Philosophy reveals what is the underlying flows behind the intellectual ideas. It is, therefore, an x-ray version of the intellectual history.