The travel Diary of a Philospher in English.
Hermann wrote this book in German and it is hard reading unless one is fluent in German.    The English translation is quite a bit easier to read and is interesting for anyone who has visited the many countries he describes.  You can read these two volumes at the following websites:

Volume one:
You can read a review of this book at:

Sander December 2012

Volume two:

Sander, October 2011
By: Sander  
Saturday, December 15, 2012