The distinction proposed here is popularly recognizedwhen we say that science is experimental or depends uponelaborate observational researches, whereas philosophy ismerely armchair thinking

James' Principles of Psychology is both a scientific and a philosophical work, although it is primarily scientific.

Since titles and subject-matter names are not likely to helpus determine whether a book is philosophical or scientific, howcan we tell? There is one criterion that we think always works,although you may have to read a certain amount of the bookbefore you can apply it. If a theoretical book emphasizesthings that lie outside the scope of your normal, routine, dailyexperience, it is a scientific work. If not, it is philosophical.