Ideen zu einer Philosophie der Natur [Ideas for a Philosophy of Nature], first published in 1797, was Schelling’s first major work in the philosophy of nature. It made him famous, in part by bringing his ideas to Goethe’s attention, and together with Von der Weltseele [On the World Soul]of 1798, helped him to secure a professorship at the University of Jena. It also marks his first definitive movement away from Fichte. The second edition, in 1803, reflects a far greater distance between the two philosophers. The editorial decision to include the second edition revisions as supplements to the original chapters makes it clear how Schelling’s thought had developed in the intervening six years.
Snow, Dale E.. "Ideen zu einer Philosophie der Natur". The Literary Encyclopedia. First published 15 June 2012
[http://www.litencyc.com/php/sworks.php?rec=true&UID=11164, accessed 30 April 2017.]