The other commentary on the _Encyclopaedia_ is supplied partly by Hegel's other published writings, and partly by the volumes (IX-XV in the Collected works) in which his editors have given his Lectures on the Philosophy of History, on Aesthetic, on the Philosophy of Religion, and on the History of Philosophy. All of these lectures, as well as the _Philosophy of Law,_ published by himself, deal however only with the third part of the philosophic system. That system (p. 28) includes (i) Logic, (ii) Philosophy of Nature, and (iii) Philosophy of Spirit. It is this third part--or rather it is the last two divisions therein (embracing the great general interests of humanity, such as law and morals, religion and art, as well as the development of philosophy itself) which form the topics of Hegel s most expanded teaching. It is in this region that he has most appealed to the liberal culture of the century, and influenced (directly or by reaction) the progress of that philosophical history and historical philosophy of which our own generation is reaping the fast-accumulating fruit. If one may foist such a category into systematic philosophy, we may say that the study of the 'Objective' and 'Absolute Spirit' is the most _interesting_ part of Hegel. Of the second part of the system there is less to be said. For nearly half a century the study of nature has passed almost completely out of the hands of the philosophers into the care of the specialists of science. There are signs indeed everywhere--and among others Helmholtz has lately reminded us--that the higher order of scientific students are ever and anon driven by the very logic of their subject into the precincts or the borders of philosophy. But the name of a Philosophy of Nature still recalls a time of hasty enthusiasms and over-grasping ambition of thought which, in its eagerness to understand the mystery of the universe jumped to conclusions on insufficient grounds, trusted to bold but fantastic analogies, and lavished an unwise contempt on the plodding industry of the mere hodman of facts and experiments. Calmer retrospection will perhaps modify this verdict, and sift the various contributions (towards a philosophical unity of the sciences) which are now indiscriminately damned by the title of _Naturphilosophie._ For the present purpose it need only be said that, for the second part of the Hegelian system, we are restricted for explanations to the notes collected by the editors of Vol. VII. part i. of the Collected works--notes derived from the annotations which Hegel himself supplied in the eight or more courses of lectures which he gave on the Philosophy of Nature between 1804 and 1830.